79 (number)

In mathematics

• An odd number.
• The smallest number that can not be represented as a sum of fewer than 19 fourth powers.
• A strictly non-palindromic number.
• The 22nd prime number
• The smallest prime number p for which the real quadratic field Q has class number greater than 1.
• A cousin prime with 83.
• An emirp, because the reverse of 79, 97, is also a prime.
• A fortunate prime.
• A prime number that is also a Gaussian prime.
• A happy prime.
• A Higgs prime.
• A Kynea prime.
• A lucky prime.
• A permutable prime, with ninety-seven.
• A Pillai prime, because 23! + 1 is divisible by 79, but 79 is not one more than a multiple of 23.
• A regular prime.
• A right-truncatable prime, because when the last digit is removed, the remaining number is still prime
• A sexy prime.
• The n value of the Wagstaff prime 201487636602438195784363.

  In science

• The atomic number of the chemical element gold is 79.

  In astronomy

• Messier object 79, a magnitude 8.5 globular cluster in the constellation Lepus
• New General Catalogue object 79, a galaxy in the constellation Andromeda

  In other fields

• Live Seventy Nine, an album by Hawkwind
• The years 79 BC, AD 79 or 1979
• The number of the French department Deux-Sèvres