97 (number)

← 96 97 98 →
← 90 91 92 93 94 95 96 97 98 99 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	ninety-seven
Ordinal	97th (ninety-seventh)
Factorization	prime
Prime	25th
Divisors	1, 97
Greek numeral	ϞΖ´
Roman numeral	XCVII
Binary	11000012
Ternary	101213
Octal	1418
Duodecimal	8112
Hexadecimal	6116

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 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 science

Ninety-seven is:

• The atomic number of berkelium, an actinide.

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 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.
• District 97, a progressive rock band from the Chicago area (named after the elementary school District 97 in Oak Park, IL.

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