757

757 is a prime number.

757 has a representation as a sum of two squares: 757 = 9² + 26².

757 is the hypotenuse of a primitive Pythagorean triple: 757² = 468² + 595².

757 is the smallest palindromic prime that remains prime when its leading digit is replaced by any nonzero digit that is a power of 2: 157, 257, 457, 857.

757 is the largest of three three-digit palindromic primes that are not the sum of consecutive composite numbers. The others are 313 and 383.

The Boeing 757 is a mid-size, narrow-body, twin-engine jetliner.

Source: Prime Curios!