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This number is a prime.
The smallest prime whose sum of digits is a fifth power. [Gupta]
The 2nd composite-digit super prime. It is the 887th prime in the list of primes, with 887 being prime. It is the first composite-digit super prime p with the property “the index of p followed by p,” i.e., 8876899 "is also prime." [Loungrides]
(There are 2 curios for this number that have not yet been approved by an editor.)