373

373 is a prime number.

373 is the only palindromic prime with all substrings prime. It is the largest prime such that each substring is prime.

373 is the sum of the squares of five consecutive primes: 373 = 3² + 5² + 7² + 11² + 13².

373 = 2¹ + 3¹ + 5² + 7³ is the sum of the first four primes raised to the powers of the first four Fibonacci numbers.

373 has a representation as a sum of two squares: 373 = 7² + 18².

373 is the hypotenuse of a primitive Pythagorean triple: 373² = 252² + 275².

Water boils at a temperature under standard conditions of about 373 kelvins.

Source: Prime Curios!