113431991 has 2 divisors, whose sum is σ = 113431992. Its totient is φ = 113431990.

The previous prime is 113431951. The next prime is 113432003. The reversal of 113431991 is 199134311.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113431991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113431951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56715995 + 56715996.

It is an arithmetic number, because the mean of its divisors is an integer number (56715996).

Almost surely, 2^113431991 is an apocalyptic number.

113431991 is a deficient number, since it is larger than the sum of its proper divisors (1).

113431991 is an equidigital number, since it uses as much as digits as its factorization.

113431991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 113431991 is about 10650.4455775334. The cubic root of 113431991 is about 484.0741055736.

The spelling of 113431991 in words is "one hundred thirteen million, four hundred thirty-one thousand, nine hundred ninety-one".