577 is a prime number.
577 is one of only two prime numbers with a square of the form AABCBC: 577² = 332929.
577 is the larger of only two three-digit primes that remain prime when inserting one, two, or three zeroes between each digit: 50707, 5007007, 500070007 are primes. The other such prime is 131.
577 has a representation as a sum of two squares: 577 = 1² + 24².
577 is the hypotenuse of a primitive Pythagorean triple: 577² = 48² + 575².
577 is a divisor of (24²)² - 1.
577 is the number of isomers of the C60H3 Buckminsterfullerene molecule.