2313111991 has 2 divisors, whose sum is σ = 2313111992. Its totient is φ = 2313111990.

The previous prime is 2313111989. The next prime is 2313112033. The reversal of 2313111991 is 1991113132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2313111991 - 2¹ = 2313111989 is a prime.

Together with 2313111989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2313111971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1156555995 + 1156555996.

It is an arithmetic number, because the mean of its divisors is an integer number (1156555996).

Almost surely, 2^2313111991 is an apocalyptic number.

2313111991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2313111991 is an equidigital number, since it uses as much as digits as its factorization.

2313111991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 31.

The square root of 2313111991 is about 48094.8229126587. The cubic root of 2313111991 is about 1322.5097626861.

The spelling of 2313111991 in words is "two billion, three hundred thirteen million, one hundred eleven thousand, nine hundred ninety-one".