31987625 has 16 divisors (see below), whose sum is σ = 42271632. Its totient is φ = 24083200.

The previous prime is 31987601. The next prime is 31987643. The reversal of 31987625 is 52678913.

It can be written as a sum of positive squares in 8 ways, for example, as 929296 + 31058329 = 964^2 + 5573^2 .

It is not a de Polignac number, because 31987625 - 2¹⁶ = 31922089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5402 + ... + 9651.

It is an arithmetic number, because the mean of its divisors is an integer number (2641977).

Almost surely, 2^31987625 is an apocalyptic number.

It is an amenable number.

31987625 is a deficient number, since it is larger than the sum of its proper divisors (10284007).

31987625 is a wasteful number, since it uses less digits than its factorization.

31987625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15085 (or 15075 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 31987625 is about 5655.7603379210. The cubic root of 31987625 is about 317.4392799336.

The spelling of 31987625 in words is "thirty-one million, nine hundred eighty-seven thousand, six hundred twenty-five".