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- 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.
- 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
- 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"
- 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.
- "Sloane's A080076 : Proth primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- "Sloane's A005282 : Mian-Chowla sequence". The On-Line Encyclopedia of integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- "Sloane's A003052 : Self numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.