97 (number)
Template:Infobox number 97 (ninety-seven) is the natural number following 96 and preceding 98. It is a prime number and the only prime in the nineties.
In mathematics
97 is:
- the 25th prime number (the largest two-digit prime number in base 10), following 89 and preceding 101.
- a Proth prime and a Pierpont prime as it is 3 × 25 + 1.<ref>Template:Cite web</ref>
- the eleventh member of the Mian–Chowla sequence.<ref>Template:Cite web</ref>
- a self number in base 10, since there is no integer that added to its own digits, adds up to 97.<ref>Template:Cite web</ref>
- the smallest odd prime that is not a cluster prime.<ref>Template:Cite OEIS</ref>
- the highest two-digit number where the sum of its digits is a square.
- the number of primes less than 29.<ref>Template:Cite OEIS</ref>
- The numbers 97, 907, 9007, 90007 and 900007 are all primes, and they are all happy primes. However, 9000007 (read as nine million seven) is composite and has the factorization 277 × 32491.
- an emirp with 79.
- an isolated prime, since 95 and 99 are not prime.
In other fields
Ninety-seven is:
- The 10-97 police code means "arrived on the scene"
- The decimal unicode number representing the Latin lowercase "a"<ref>Template:Cite web</ref>