|Cardinal||one hundred seventy-nine|
(one hundred seventy-ninth)
179 is an odd number.
179 is a prime number; that is, it is not divisible by any integer (except for 1 and itself). It is an Eisenstein prime, as it is indivisible even by complex Gaussian integers. It is a Chen prime, being two less than another prime, 181. It is a full reptend prime, meaning 1/179 has a decimal expansion of a repeated sequence of 178 digits.
179 is a safe prime, as it is one more than two times the prime 89. It is also a Sophie Germain prime, as the prime 359 is one more than two times 179. It is only the fifth number with both of these properties (after 5, 11, 23, and 83).
|Wikimedia Commons has media related to 179 (number).|
- Number Facts and Trivia: 179
- The Number 179
- The Positive Integer 179
- Prime curiosities: 179
- Number Gossip: 179
- Number Trivia: 179
- "Sloane's A059455 : Safe primes which are also Sophie Germain primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.