31664985 has 32 divisors (see below), whose sum is σ = 56567808. Its totient is φ = 14992320.

The previous prime is 31664977. The next prime is 31664993. The reversal of 31664985 is 58946613.

It is an interprime number because it is at equal distance from previous prime (31664977) and next prime (31664993).

It is not a de Polignac number, because 31664985 - 2³ = 31664977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4864 + ... + 9326.

It is an arithmetic number, because the mean of its divisors is an integer number (1767744).

Almost surely, 2^31664985 is an apocalyptic number.

It is an amenable number.

31664985 is a deficient number, since it is larger than the sum of its proper divisors (24902823).

31664985 is a wasteful number, since it uses less digits than its factorization.

31664985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4525.

The product of its digits is 155520, while the sum is 42.

The square root of 31664985 is about 5627.1649167232. The cubic root of 31664985 is about 316.3683981270.

The spelling of 31664985 in words is "thirty-one million, six hundred sixty-four thousand, nine hundred eighty-five".