31604985 has 40 divisors (see below), whose sum is σ = 57484680. Its totient is φ = 16609536.

The previous prime is 31604959. The next prime is 31604987. The reversal of 31604985 is 58940613.

31604985 is a `hidden beast` number, since 3 + 160 + 498 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3504384 + 28100601 = 1872^2 + 5301^2 .

It is not a de Polignac number, because 31604985 - 2¹³ = 31596793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31604987) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29031 + ... + 30099.

It is an arithmetic number, because the mean of its divisors is an integer number (1437117).

Almost surely, 2^31604985 is an apocalyptic number.

It is an amenable number.

31604985 is a deficient number, since it is larger than the sum of its proper divisors (25879695).

31604985 is a wasteful number, since it uses less digits than its factorization.

31604985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1150 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 31604985 is about 5621.8311073884. The cubic root of 31604985 is about 316.1684495523.

The spelling of 31604985 in words is "thirty-one million, six hundred four thousand, nine hundred eighty-five".