79

79 is a prime number.

79 is the smallest prime whose sum of digits is a fourth power: 7 + 9 = 16 = 2⁴.

79 = 2⁷ – 7².

79 is the maximum number of regions into which 12 lines divide a plane. It is possible to divide a flat pancake into 79 pieces by making 13 straight cuts.


The chemical element gold has atomic number 79.

Source: Prime Curios!