136279841
This number is a prime.
The exponent for the largest Mersenne prime (and, in turn,
the largest prime) was discovered on October 12, 2024 by
Luke Durant and verified on October 19, 2024 by GIMPS. [Reamy]
The smallest Mersenne prime exponent containing every digit
that is not a multiple of 5. Note that if you remove either the first
or last digit you get a distinct-digit number. [Nie]
The largest known Mersenne prime exponent that is also an emirp. [Harrison]
The only known Mersenne prime exponent to both begin and
end with the digit 1. [Harrison]
136279841 is the exponent of the largest known Mersenne prime (as of 20 Novvember 2025) and also a happy number, which was reported by Simon Cavegn. See Puzzle 21. [Rivera]
(There are 2 curios for this number that have not yet been approved by an editor.)
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