13113431 has 2 divisors, whose sum is σ = 13113432. Its totient is φ = 13113430.

The previous prime is 13113413. The next prime is 13113467. The reversal of 13113431 is 13431131.

Together with previous prime (13113413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13113431 is a prime.

It is a super-2 number, since 2×13113431² = 343924145183522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13113491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6556715 + 6556716.

It is an arithmetic number, because the mean of its divisors is an integer number (6556716).

Almost surely, 2^13113431 is an apocalyptic number.

13113431 is a deficient number, since it is larger than the sum of its proper divisors (1).

13113431 is an equidigital number, since it uses as much as digits as its factorization.

13113431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 17.

The square root of 13113431 is about 3621.2471608549. The cubic root of 13113431 is about 235.8153719737.

Adding to 13113431 its reverse (13431131), we get a palindrome (26544562).

The spelling of 13113431 in words is "thirteen million, one hundred thirteen thousand, four hundred thirty-one".