6
Template:Short description Template:About Template:Distinguish Template:Pp-vandalism Template:Infobox number 6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number.<ref name=":0" />
In mathematics
A six-sided polygon is a hexagon,<ref name=":0" /> one of the three regular polygons capable of tiling the plane. A hexagon also has 6 edges as well as 6 internal and external angles.
6 is the second smallest composite number.<ref name=":0">Template:Cite web</ref> It is also the first number that is the sum of its proper divisors, making it the smallest perfect number.<ref>Template:Cite book</ref> It is also the only perfect number that doesn't have a digital root of 1.<ref>Template:Cite web</ref> 6 is the first unitary perfect number, since it is the sum of its positive proper unitary divisors, without including itself. Only five such numbers are known to exist.<ref>Template:Cite OEIS</ref> 6 is the largest of the four all-Harshad numbers.<ref>Template:Cite web</ref>
6 is the 2nd superior highly composite number,<ref>Template:Cite web</ref> the 2nd colossally abundant number,<ref>Template:Cite web</ref> the 3rd triangular number,<ref>Template:Cite web</ref> the 4th highly composite number,<ref>Template:Cite web</ref> a pronic number,<ref>Template:Cite web</ref> a congruent number,<ref>Template:Cite OEIS</ref> a harmonic divisor number,<ref>Template:Cite web</ref> and a semiprime.<ref>Template:Cite OEIS</ref> 6 is also the first Granville number, or <math>\mathcal{S}</math>-perfect number. A Golomb ruler of length 6 is a "perfect ruler".<ref>Bryan Bunch, The Kingdom of Infinite Number. New York: W. H. Freeman & Company (2000): 72</ref>
The six exponentials theorem guarantees that under certain conditions one of a set of six exponentials is transcendental.<ref>Template:Cite web</ref> The smallest non-abelian group is the symmetric group <math>\mathrm {S_{3}}</math> which has 3! = 6 elements.<ref name=":0" /> 6 the answer to the two-dimensional kissing number problem.<ref>Template:Cite web</ref>
A cube has 6 faces. A tetrahedron has 6 edges. In four dimensions, there are a total of six convex regular polytopes.
In the classification of finite simple groups, twenty of twenty-six sporadic groups in the happy family are part of three families of groups which divide the order of the friendly giant, the largest sporadic group: five first generation Mathieu groups, seven second generation subquotients of the Leech lattice, and eight third generation subgroups of the friendly giant. The remaining six sporadic groups do not divide the order of the friendly giant, which are termed the pariahs (Ly, O'N, Ru, J4, J3, and J1).<ref>Template:Cite journal</ref>
6 is the smallest integer which is not an exponent of a prime number, making it the smallest integer greater than 1 for which there does not exist a finite field of that size.<ref>Template:Cite book</ref>
List of basic calculations
| Multiplication | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 25 | 50 | 100 | 1000 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 × x | 6 | 12 | 18 | 24 | 30 | 36 | 42 | 48 | 54 | 60 | 66 | 72 | 78 | 84 | 90 | 96 | 102 | 108 | 114 | 120 | 150 | 300 | 600 | 6000 |
| Division | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 ÷ x | 6 | 3 | 2 | 1.5 | 1.2 | 1 | 0.Template:Overline | 0.75 | 0.Template:Overline | 0.6 | 0.Template:Overline | 0.5 | 0.Template:Overline | 0.Template:Overline | 0.4 | |
| x ÷ 6 | 0.1Template:Overline | 0.Template:Overline | 0.5 | 0.Template:Overline | 0.8Template:Overline | 1 | 1.1Template:Overline | 1.Template:Overline | 1.5 | 1.Template:Overline | 1.8Template:Overline | 2 | 2.1Template:Overline | 2.Template:Overline | 2.5 |
| Exponentiation | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6Template:Sup | 6 | 36 | 216 | 1296 | 7776 | 46656 | 279936 | 1679616 | 10077696 | 60466176 | 362797056 | 2176782336 | 13060694016 | |
| xTemplate:Sup | 1 | 64 | 729 | 4096 | 15625 | 46656 | 117649 | 262144 | 531441 | 1000000 | 1771561 | 2985984 | 4826809 |
Greek and Latin word parts
Template:Lang is classical Greek for "six".<ref name=":0" /> Thus:
- "Hexadecimal" combines Template:Lang with the Latinate Template:Lang to name a number base of 16<ref>Template:Cite web</ref>
- A hexagon is a regular polygon with six sides<ref>Template:Cite web</ref>
- Template:Lang is a French nickname for the continental part of Metropolitan France for its resemblance to a regular hexagon
- A hexahedron is a polyhedron with six faces, with a cube being a special case<ref>Template:Cite web</ref>
- Hexameter is a poetic form consisting of six feet per line
- A "hex nut" is a nut with six sides, and a hex bolt has a six-sided head
- The prefix "Template:Lang" also occurs in the systematic name of many chemical compounds, such as hexane which has 6 carbon atoms (Template:Chem2).
The prefix sex-
Sex- is a Latin prefix meaning "six".<ref name=":0" /> Thus:
- Senary is the ordinal adjective meaning "sixth"<ref>Template:Cite web</ref>
- People with sexdactyly have six fingers on each hand
- The measuring instrument called a sextant got its name because its shape forms one-sixth of a whole circle
- A group of six musicians is called a sextet
- Six babies delivered in one birth are sextuplets
- Sexy prime pairs – Prime pairs differing by six are sexy, because sex is the Latin word for six.<ref>Template:Cite book</ref><ref>Template:Cite web</ref>
The SI prefix for 10006 is exa- (E), and for its reciprocal atto- (a).
Evolution of the Hindu-Arabic digit
The evolution of the modern digit 6 appears to be more simple when compared with the other digits. The modern 6 can be traced back to the Brahmi numerals of India, which are first known from the Edicts of Ashoka Template:Circa.<ref>Template:Cite book</ref><ref>Template:Cite book</ref><ref>Template:Cite book</ref><ref>Template:Cite book</ref> It was written in one stroke like a cursive lowercase e rotated 90 degrees clockwise. Gradually, the upper part of the stroke (above the central squiggle) became more curved, while the lower part of the stroke (below the central squiggle) became straighter. The Arabs dropped the part of the stroke below the squiggle. From there, the European evolution to our modern 6 was very straightforward, aside from a flirtation with a glyph that looked more like an uppercase G.<ref>Georges Ifrah, The Universal History of Numbers: From Prehistory to the Invention of the Computer transl. David Bellos et al. London: The Harvill Press (1998): 395, Fig. 24.66</ref>
On the seven-segment displays of calculators and watches, 6 is usually written with six segments. Some historical calculator models use just five segments for the 6, by omitting the top horizontal bar. This glyph variant has not caught on; for calculators that can display results in hexadecimal, a 6 that looks like a "b" is not practical.
Just as in most modern typefaces, in typefaces with text figures the character for the digit 6 usually has an ascender, as, for example, in 
.<ref>Template:Cite book</ref>
This digit resembles an inverted 9. To disambiguate the two on objects and documents that can be inverted, the 6 has often been underlined, both in handwriting and on printed labels.
Chemistry
- The sixfold symmetry of snowflakes arises from the hexagonal crystal structure of ordinary ice.<ref>Template:Cite book</ref>
Anthropology
- A coffin is traditionally buried six feet under the ground; thus, the phrase "six feet under" means that a person (or thing, or concept) is dead.<ref>Template:Cite web</ref>
- Six is a lucky number in Chinese culture.<ref>"Chinese Numbers 1 to 10 | maayot". maayot • Bite-size daily Chinese stories. 2021-11-22. Retrieved 2025-01-17.</ref>
- "Six" is used as an informal slang term for the British Secret Intelligence Service, MI6.<ref>Template:Cite book</ref>
Buddhism
Buddhism describes six realms of existence or realms into which beings can be reborn according to their deeds. They are visualised on the Tibetan wheel of life and illustrate the perpetual cyclical existence in samsara. The six perfections or "six paramitas" are among the best-known Buddhist symbols of the six. In Mahayana Buddhism, these are fundamental spiritual qualities on the path of the bodhisattva to achieve nirvana.
See also
References
- Template:Cite journal
- A Property of the Number Six, Chapter 6, P Cameron, JH v. Lint, Designs, Graphs, Codes and their Links Template:ISBN
- Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 67 - 69