This number is a prime.

+ The largest known Mersenne prime exponent (as of 23 August 2008): see 2^43112609-1.

+ Mersenne prime M47, i.e. 2^43112609-1 contains the exponent of (the larger) Mersenne prime M50, i.e., 77232917. [Harrison]

+ The largest Mersenne prime exponent such that changing every digit n with 2^n-1 yields a prime. [Sariyar]

(There is one curio for this number that has not yet been approved by an editor.)

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