13131904 has 16 divisors (see below), whose sum is σ = 26161470. Its totient is φ = 6565888.

The previous prime is 13131901. The next prime is 13131917. The reversal of 13131904 is 40913131.

It can be written as a sum of positive squares in only one way, i.e., 9290304 + 3841600 = 3048^2 + 1960^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (13131901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51169 + ... + 51424.

Almost surely, 2^13131904 is an apocalyptic number.

It is an amenable number.

13131904 is a deficient number, since it is larger than the sum of its proper divisors (13029566).

13131904 is an equidigital number, since it uses as much as digits as its factorization.

13131904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102607 (or 102595 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 13131904 is about 3623.7969038013. The cubic root of 13131904 is about 235.9260517141.

The spelling of 13131904 in words is "thirteen million, one hundred thirty-one thousand, nine hundred four".