5251

This number is a composite.

+ The only brilliant number, 5251 = 59 × 89, concatenated from successive double-digit numbers whose the concatenation of prime factors, 59, 89 creates a semi-prime 5989 = 53 × 113, whose also the concatenations of prime factors create a prime, 53113 and an emirp, 11353. [Loungrides]

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