137

137 is a prime number.

137 has a representation as a sum of two squares: 137 = 4² + 11².

137 and 139 form a twin prime pair.

137 is the hypotenuse of a primitive Pythagorean triple: 137² = 88² + 105².

137 is a divisor of 37⁴ - 1.

137 = 128 + 8 + 1 = 2⁷ + 2³ + 2⁰.

A molecule of chlorophyll a (C₅₅H₇₂O₅N₄Mg) consists of 137 atoms.

Source: Prime Curios!