13131604 has 6 divisors (see below), whose sum is σ = 22980314. Its totient is φ = 6565800.

The previous prime is 13131593. The next prime is 13131607. The reversal of 13131604 is 40613131.

13131604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 1435204 = 3420^2 + 1198^2 .

It is a super-2 number, since 2×13131604² = 344878047225632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1641447 + ... + 1641454.

Almost surely, 2^13131604 is an apocalyptic number.

It is an amenable number.

13131604 is a deficient number, since it is larger than the sum of its proper divisors (9848710).

13131604 is a wasteful number, since it uses less digits than its factorization.

13131604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282905 (or 3282903 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 13131604 is about 3623.7555105167. The cubic root of 13131604 is about 235.9242551137.

Adding to 13131604 its reverse (40613131), we get a palindrome (53744735).

The spelling of 13131604 in words is "thirteen million, one hundred thirty-one thousand, six hundred four".