# 179 (number)

From HandWiki

__: Natural number__

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

Cardinal | one hundred seventy-nine | |||

Ordinal | 179th (one hundred seventy-ninth) | |||

Factorization | prime | |||

Prime | 41st | |||

Divisors | 1, 179 | |||

Greek numeral | ΡΟΘ´ | |||

Roman numeral | CLXXIX | |||

Binary | 10110011_{2} | |||

Ternary | 20122_{3} | |||

Quaternary | 2303_{4} | |||

Quinary | 1204_{5} | |||

Senary | 455_{6} | |||

Octal | 263_{8} | |||

Duodecimal | 12B_{12} | |||

Hexadecimal | B3_{16} | |||

Vigesimal | 8J_{20} | |||

Base 36 | 4Z_{36} |

**179** (**one hundred [and] seventy-nine**) is the natural number following 178 and preceding 180.

## In mathematics

179 is part of the Cunningham chain of prime numbers 89, 179, 359, 719, 1439, 2879, in which each successive number is two times the previous number, plus one. Among Cunningham chains of this length, this one has the smallest numbers. Because 179 is neither the start nor the end of this chain, it is both a safe prime and a Sophie Germain prime.^{[1]} It is also a super-prime number, because it is the 41st smallest prime and 41 is also prime. Since 971 (the digits of 179 reversed) is prime, 179 is an emirp.

## In other fields

Astronomers have suggested that sunspot frequency undergoes a cycle of approximately 179 years in length.^{[2]}

## See also

- AD 179 and 179 BC
- List of highways numbered 179
- All pages with titles containing
*179*

## External links

## References

- ↑ Wells, David (1997).
*The Penguin Dictionary of Curious and Interesting Numbers*. Penguin. p. 115. ISBN 9780140261493. https://books.google.com/books?id=kQRPkTkk_VIC&pg=PA115. - ↑ Cohen, Theodore J.; Lintz, Paul R. (August 1974). "Long term periodicities in the sunspot cycle".
*Nature***250**(5465): 398–400. doi:10.1038/250398a0. Bibcode: 1974Natur.250..398C.

Original source: https://en.wikipedia.org/wiki/179 (number).
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