# 97 (number)

From HandWiki

__: Natural number__

**Short description**
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---|---|---|---|---|

Cardinal | ninety-seven | |||

Ordinal | 97th (ninety-seventh) | |||

Factorization | prime | |||

Prime | 25th | |||

Divisors | 1, 97 | |||

Greek numeral | ϞΖ´ | |||

Roman numeral | XCVII | |||

Binary | 1100001_{2} | |||

Ternary | 10121_{3} | |||

Quaternary | 1201_{4} | |||

Quinary | 342_{5} | |||

Senary | 241_{6} | |||

Octal | 141_{8} | |||

Duodecimal | 81_{12} | |||

Hexadecimal | 61_{16} | |||

Vigesimal | 4H_{20} | |||

Base 36 | 2P_{36} |

**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 × 2
^{5}+ 1.^{[1]} - the eleventh member of the Mian–Chowla sequence.
^{[2]} - a self number in base 10, since there is no integer that added to its own digits, adds up to 97.
^{[3]} - the smallest odd prime that is not a cluster prime.
^{[4]} - the highest two-digit number where the sum of its digits is a square.
- the number of primes <= 2
^{9}.^{[5]} - 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 factorisation 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 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"
^{[6]}

## 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, Illinois).

## See also

- List of highways numbered 97

## References

- ↑ "Sloane's A080076 : Proth primes". OEIS Foundation. https://oeis.org/A080076.
- ↑ "Sloane's A005282 : Mian-Chowla sequence". OEIS Foundation. https://oeis.org/A005282.
- ↑ "Sloane's A003052 : Self numbers". OEIS Foundation. https://oeis.org/A003052.
- ↑ Sloane, N. J. A., ed. "Sequence A038133 (Odd primes that are not cluster primes)". OEIS Foundation. https://oeis.org/A038133. Retrieved 2022-08-19.
- ↑ Sloane, N. J. A., ed. "Sequence A007053". OEIS Foundation. https://oeis.org/A007053. Retrieved 2022-06-02.
- ↑ "Unicode Lookup: convert special characters". https://unicodelookup.com/.

Original source: https://en.wikipedia.org/wiki/97 (number).
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