199

This number is a prime.

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(199, 211, 223) is the first triple of primes of the form (p, p+12, p+24). Note that for p < 1000 is the only such triple. Note also that 199211 and 223211 are primes. [Loungrides]

1000^199-999^199 is the only non titanic prime of the form p=1000^x-999^x. Note that the component 199 is equal to the smallest emirp of the form q=100^x-99^x. [Loungrides]

The smallest emirp formed from a double-digit number followed by the product of its digits. [Loungrides]