3557

This number is a prime.

A prime obtained by concatenating the least two pairs of twin primes. [Necula]

The only 4-digit prime-digit prime starting with a double-digit brilliant number, (35) and followed by its prime factors. [Loungrides]

10^3.557 is greater than 3557, and 3557 is the smallest prime with such property. [Leonardis]