97 (ninety-seven) is the natural number following 96 and preceding 98.

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 as it is 3 × 25 + 1.
the eleventh member of the Mian–Chowla sequence.
a self number in base 10, since there is no integer that added to its own digits adds up to 97.
the highest two digit number where the sum of its digits is a square.

The numbers 97, 907, 9007, 90007 and 900007 are happy primes. However, 9000007 (read as nine million seven) is composite and has the factorisation 277 × 32491.
In astronomy

Messier object M97, a 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

In other fields

Ninety-seven is:

The atomic number of berkelium, an actinide.
The 97th United States Congress met during the Ronald Reagan administration, from January 1981 to January 1983
The 10-97 police code means «arrived on the scene»
STS-97 Space Shuttle Endeavour mission launched November 30, 2000
The 97th Infantry Division was a unit of the United States Army in World War I and World War II.
Madden NFL 97 was the first John Madden NFL American football game to be created in the 32-bit gaming era.
Radio stations broadcasting on frequencies near 97, such as Hot 97, New York City and 97X, Tampa, Florida
The decimal unicode number representing the latin lowercase «a»

In music

A song Baby Boy / Saturday Night ’97 by Whigfield
The number of the Southern Railway train in the Wreck of the Old 97, a ballad recorded by numerous artists, including Flatt and Scruggs, Woody Guthrie, Johnny Cash, Nine Pound Hammer, and Hank Snow.
The Old 97’s are an alt-country band, which took their name from the song «The Wreck of the Old 97»
A song by Alkaline Trio off their self-titled album
The Marching 97, marching band of Lehigh University.

In sports

The car number of Kurt Busch’s Ford when he won the 2004 NASCAR Nextel Cup Series championship.

See also

List of Highways Numbered 97