This number is a prime.

+ 7777/2861 is the fraction with the smallest prime denominator closer to e than 1650/607.

+ The largest known prime number that cannot be expressed as the sum of 3 pentagonal numbers. [Capelle]

+ The smallest prime which prefixed by the concatenation of two perfect numbers. [Firoozbakht]

+ Magnus Carlsen's peak rating is 2861, the highest in chess history.

+ Smallest prime that uses four distinct digits such that every different permutation of its digits is composite. [Vantieghem]

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