3701

This number is a prime.

The second case of six consecutive primes, (3701, 3709, 3719, 3727, 3733, 3739), corresponding to another case of six consecutive primes by deleting their first same digit, i.e., (701, 709, 719, 727, 733, 739). [Loungrides]

Least prime whose square has the previous prime as substring: 3701^2 = 13697401 and the previous prime is 3697. [Lava]