593

593 is a prime number. It is a Sophie Germain prime because 2 x 593 + 1 = 1187 is also prime.

593 has a representation as a sum of two squares: 593 = 8² + 23².

593 is the hypotenuse of a primitive Pythagorean triple: 593² = 368² + 465².

593 = 9² + 2⁹ = 3^2*2 + 2^3*3.

593 is the number on the conning tower of the submarine USS Wayne in the movie The Spy Who Loved Me.

Source: Prime Curios!