31531500325 has 18 divisors (see below), whose sum is σ = 42338041494. Its totient is φ = 23284797120.

The previous prime is 31531500311. The next prime is 31531500337. The reversal of 31531500325 is 52300513513.

It can be written as a sum of positive squares in 9 ways, for example, as 27811232289 + 3720268036 = 166767^2 + 60994^2 .

It is not a de Polignac number, because 31531500325 - 2⁷ = 31531500197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31531500293 and 31531500302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3727314 + ... + 3735763.

Almost surely, 2^31531500325 is an apocalyptic number.

It is an amenable number.

31531500325 is a deficient number, since it is larger than the sum of its proper divisors (10806541169).

31531500325 is a wasteful number, since it uses less digits than its factorization.

31531500325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7463113 (or 7463095 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 28.

The spelling of 31531500325 in words is "thirty-one billion, five hundred thirty-one million, five hundred thousand, three hundred twenty-five".