1319

This number is a prime.

The sum of digits of the sum of 13 first primes (238) is 13 (prime) and the sum of digits of the sum of 19 first primes (568) is 19 (prime). Note that 1913 is also prime. [Gallardo]

The buildings inside the Cheyenne Mountain Complex (outside Colorado Springs, Colorado) which house the North American Aerospace Defense Command (NORAD) are supported on 1319 springs to protect the delicate electronic equipment inside the mountain from shock. [McCranie]

The concatenation of two sexy teens (1319 or 1913) is prime no matter which way you do it. The latter is an emirp. [Green]

The average number of moderate earthquakes per year.