9871
This number is a prime.
The largest 4-digit prime with 4 distinct digits. Curiously, it is also an emirp whose sum of digits is the square of a prime. [Post]
The first case of two consecutive balanced primes that are both distinct-digit primes and emirps. [Loungrides]
The largest 4-digit distinct-digit emirp abcd such that abbcccdddd is also emirp, i.e., 9887771111. [Loungrides]
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