31808985 has 32 divisors (see below), whose sum is σ = 55211520. Its totient is φ = 15545088.

The previous prime is 31808963. The next prime is 31809013. The reversal of 31808985 is 58980813.

It is not a de Polignac number, because 31808985 - 2⁷ = 31808857 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, 30096 + ... + 31134.

It is an arithmetic number, because the mean of its divisors is an integer number (1725360).

Almost surely, 2^31808985 is an apocalyptic number.

It is an amenable number.

31808985 is a deficient number, since it is larger than the sum of its proper divisors (23402535).

31808985 is a wasteful number, since it uses less digits than its factorization.

31808985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 31808985 is about 5639.9454784599. The cubic root of 31808985 is about 316.8472463428.

The spelling of 31808985 in words is "thirty-one million, eight hundred eight thousand, nine hundred eighty-five".