603

603 = 3 x 3 x 67.

The first 603 digits of 603⁶⁰³ form a 2002-bit prime.

603 is the smallest number n so that n, n + 1, and n + 2 are all the product of a prime and the square of a prime: 603 = 67 x 3²; 604 = 151 x 2²; 605 = 5 x 11².

603² = 363609 = (3 - 6 - 3 + 609)².

603 is 1133 in base 8, 311 in base 14, and 113 in base 24.

Source: Prime Curios!