2431

This number is a composite.

The smallest 2-sphenic number, i.e., a 3-almost prime with distinct double-digit prime factors. Note, that it consists of the first four positive digits and it can be represented as the product of first three double-digit primes, 11*13*17, whose the concatenation in order, i.e., 111317, is prime. [Loungrides]

The only number which is formed from four consecutive digits and also the product of three consecutive primes. [Silva]