601 is a prime number.
599 and 601 form a twin prime pair.
601 has a representation as a sum of two squares: 601 = 52 + 242.
601 is the hypotenuse of a primitive Pythagorean triple: 6012 = 2402 + 5512.
601 is a centered pentagonal number.
601 is the lesser member p of the least sexy prime pairs (p, p + 6) such that all numbers in between have the same number of prime divisors (counted with multiplicity).
The Minivac 601 Digital Computer Kit was a product created by Claude Shannon and sold by Scientific Development Corporation as early as 1961.
Source: Number Gossip