113111031991 has 2 divisors, whose sum is σ = 113111031992. Its totient is φ = 113111031990.

The previous prime is 113111031973. The next prime is 113111032061. The reversal of 113111031991 is 199130111311.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113111031991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113111031941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56555515995 + 56555515996.

It is an arithmetic number, because the mean of its divisors is an integer number (56555515996).

Almost surely, 2^113111031991 is an apocalyptic number.

113111031991 is a deficient number, since it is larger than the sum of its proper divisors (1).

113111031991 is an equidigital number, since it uses as much as digits as its factorization.

113111031991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 31.

The spelling of 113111031991 in words is "one hundred thirteen billion, one hundred eleven million, thirty-one thousand, nine hundred ninety-one".