461 is a prime number.
461 has a representation as a sum of two squares: 461 = 102 + 192.
461 and 463 form a twin prime pair.
461 is the hypotenuse of a primitive Pythagorean triple: 4612 = 2612 + 3802.
461 is the largest number for which ((102n) + 1)/101 is known to be a prime number.
Source: Prime Curios!