131

131 is a prime number. It is a Sophie Germain prime because 2 x 131 + 1 = 263 is also prime.

The 131st Fibonacci number (1066340417491710595814572169) is the smallest Fibonacci prime that contains all the digits from 0 to 9.

131 is the smallest prime that stays prime when the end digits (on both sides) are repeated once: 11311 is also prime.

131 is the smallest integer such that the sum of its digits in every base b = 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 is prime.


Locomotive 131 plunges off the edge of a ravine in the movie Back to the Future Part III.

Source: Prime Curios!