9431

This number is a prime.

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The largest 4-digit distinct-digit prime whose sum of the repdigit numbers of its digits, self-repeated, is an emirp, i.e., 999999999+333+4444+1 = 1000004777. [Loungrides]

Submitted: 2017-10-21 14:09:49; Last Modified: 2020-07-25 23:37:34.