13113931 has 2 divisors, whose sum is σ = 13113932. Its totient is φ = 13113930.

The previous prime is 13113929. The next prime is 13113983. The reversal of 13113931 is 13931131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13113931 - 2¹ = 13113929 is a prime.

It is a super-2 number, since 2×13113931² = 343950372545522, which contains 22 as substring.

Together with 13113929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13113431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6556965 + 6556966.

It is an arithmetic number, because the mean of its divisors is an integer number (6556966).

Almost surely, 2^13113931 is an apocalyptic number.

13113931 is a deficient number, since it is larger than the sum of its proper divisors (1).

13113931 is an equidigital number, since it uses as much as digits as its factorization.

13113931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243, while the sum is 22.

The square root of 13113931 is about 3621.3161971858. The cubic root of 13113931 is about 235.8183690583.

The spelling of 13113931 in words is "thirteen million, one hundred thirteen thousand, nine hundred thirty-one".