2617
This number is a prime.
The largest prime index of a mountain prime p in the sequence of mountain primes, i.e., p=123457897654321. [Loungrides]
The smallest anagraprod "anagram by product" prime. E.g., 2*6=12, 6*1=6, 1*7=7, and 2617 is composed of digits 1, 2, 6, and 7. [Angelini]
(There is one curio for this number that has not yet been approved by an editor.)
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