3131131525 has 12 divisors (see below), whose sum is σ = 3946254244. Its totient is φ = 2463840000.

The previous prime is 3131131513. The next prime is 3131131529. The reversal of 3131131525 is 5251311313.

It can be written as a sum of positive squares in 6 ways, for example, as 992439009 + 2138692516 = 31503^2 + 46246^2 .

It is not a de Polignac number, because 3131131525 - 2¹⁵ = 3131098757 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3131131525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131131529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1025076 + ... + 1028125.

Almost surely, 2^3131131525 is an apocalyptic number.

It is an amenable number.

3131131525 is a deficient number, since it is larger than the sum of its proper divisors (815122719).

3131131525 is a wasteful number, since it uses less digits than its factorization.

3131131525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053272 (or 2053267 counting only the distinct ones).

The product of its digits is 1350, while the sum is 25.

The square root of 3131131525 is about 55956.5145894560. The cubic root of 3131131525 is about 1462.9644410925.

Adding to 3131131525 its reverse (5251311313), we get a palindrome (8382442838).

The spelling of 3131131525 in words is "three billion, one hundred thirty-one million, one hundred thirty-one thousand, five hundred twenty-five".