13151715131

This number is a prime.

                                                                1 3151715131

This palindromic odd-digit "peak-and-valley" prime of prime length contains a prime number of prime digits (counted with or without multiplicity) and a total of 17 distinct primes as substrings (including the prime digits and the whole prime itself, viz: 3, 5, 7, 13, 17, 31, 71, 131, 151, 5171, 7151, 13151, 15131, 31517, 517151, 1315171513 and 13151715131). [Hasler]