2861

This number is a prime.

+ 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 once achieved a rating of 2861 (highest in chess history at the time).

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

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