4783

This number is a prime.

There are 4783 space lattice groups in 4-D Euclidean space. [Post]

The only prime concatenated from the only two double-digit primes, 47 and 83, having the following property: their cubes are concatenated from two 3-digit primes, i.e., 47^3 = 103823 and 83^3 = 571787. [Loungrides]