241

241 is a prime number.

241 has a representation as a sum of two squares: 241 = 4² + 15².

239 and 241 form a twin prime pair.

241 is the hypotenuse of a primitive Pythagorean triple: 241² = 120² + 209².

241 is 111 in base 15.

241 is the smallest prime p such that p plus the reversal of p equals a palindromic prime: 241 + 142 = 383.

Reel Big Fish wrote a song entitled "241", in which the number is repeated as the only lyric.

Source: Prime Curios!