13115923 has 2 divisors, whose sum is σ = 13115924. Its totient is φ = 13115922.

The previous prime is 13115899. The next prime is 13115929. The reversal of 13115923 is 32951131.

It is a strong prime.

It is an emirp because it is prime and its reverse (32951131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13115923 is a prime.

It is a super-2 number, since 2×13115923² = 344054872283858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13115929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6557961 + 6557962.

It is an arithmetic number, because the mean of its divisors is an integer number (6557962).

Almost surely, 2^13115923 is an apocalyptic number.

13115923 is a deficient number, since it is larger than the sum of its proper divisors (1).

13115923 is an equidigital number, since it uses as much as digits as its factorization.

13115923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 13115923 is about 3621.5912248624. The cubic root of 13115923 is about 235.8303086872.

The spelling of 13115923 in words is "thirteen million, one hundred fifteen thousand, nine hundred twenty-three".