31500625 has 20 divisors (see below), whose sum is σ = 42402052. Its totient is φ = 23256000.

The previous prime is 31500611. The next prime is 31500649. The reversal of 31500625 is 52600513.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 30514576 + 986049 = 5524^2 + 993^2 .

It is not a de Polignac number, because 31500625 - 2⁹ = 31500113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31500596 and 31500605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6187 + ... + 10063.

Almost surely, 2^31500625 is an apocalyptic number.

It is an amenable number.

31500625 is a deficient number, since it is larger than the sum of its proper divisors (10901427).

31500625 is an equidigital number, since it uses as much as digits as its factorization.

31500625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910 (or 3895 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 31500625 is about 5612.5417593101. The cubic root of 31500625 is about 315.8200686123.

The spelling of 31500625 in words is "thirty-one million, five hundred thousand, six hundred twenty-five".