130 (number)

Template:Infobox number 130 (one hundred [and] thirty) is the natural number following 129 and preceding 131.

In mathematics

130 is a sphenic number. It is a noncototient since there is no answer to the equation x - φ(x) = 130.

130 is the only integer that is the sum of the squares of its first four divisors, including 1: 1² + 2² + 5² + 10² = 130.

130 is the largest number that cannot be written as the sum of four hexagonal numbers.<ref>MathWorld - Hexagonal Number</ref>

130 equals both 2⁷ + 2 and 5³ + 5 and is therefore a doubly strictly Template:Not a typo number.<ref>Template:Cite journal</ref>

In other fields

• A 130-30 fund or a ratio up to 150/50 is a type of collective investment vehicle

References

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