{{Infobox number
| number = 97
| factorization = [[prime number|prime]]
| prime = 25th
| divisor = 1, 97
}}
'''97''' ('''ninety-seven''') is the [[natural number]] following [[96 (number)|96]] and preceding [[98 (number)|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|base 10]]), following [[89 (number)|89]] and preceding [[101 (number)|101]].
* a [[Proth prime]] and a [[Pierpont prime]] as it is 3 × 2<sup>5</sup> + 1.<ref>{{Cite web|url=https://oeis.org/A080076|title=Sloane's A080076 : Proth primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}</ref>
* the eleventh member of the [[Mian–Chowla sequence]].<ref>{{Cite web|url=https://oeis.org/A005282|title=Sloane's A005282 : Mian-Chowla sequence|website=The On-Line Encyclopedia of integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}</ref>
* a [[self number]] in base 10, since there is no [[integer]] that added to its own digits, adds up to 97.<ref>{{Cite web|url=https://oeis.org/A003052|title=Sloane's A003052 : Self numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}</ref>
* the smallest odd prime that is not a [[cluster prime]].<ref>{{cite OEIS|A038133|Odd primes that are not cluster primes|access-date=2022-08-19}}</ref>
* the highest two-digit number where the sum of its digits is a square.
* the number of primes <= 2<sup>9</sup>.<ref>{{cite OEIS|A007053|Number of primes <= 2^n|access-date=2022-06-02}}</ref>
* The numbers 97, 907, 9007, 90007 and 900007 are all primes, and they are all [[happy prime]]s. However, 9000007 (read as ''nine million seven'') is [[composite number|composite]] and has the factorisation [[277 (number)|277]] × 32491.
* an [[emirp]]
* an isolated prime, since 95 and 99 aren't prime.
==In science==
'''Ninety-seven''' is:
* The [[atomic number]] of [[berkelium]], an [[actinide]].
===In astronomy===
* [[Messier object]] [[Messier 97|M97]], a [[visual magnitude|magnitude]] 12.0 [[planetary nebula]] in the [[constellation]] [[Ursa Major]], also known as the [[Owl Nebula]]
* The [[New General Catalogue]] object [[NGC 97]], an [[elliptical galaxy]] in the constellation [[Andromeda (constellation)|Andromeda]]
==In other fields==
'''Ninety-seven''' is:
* The [[97th United States Congress]] met during
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