31670985 has 16 divisors (see below), whose sum is σ = 51198336. Its totient is φ = 16716288.

The previous prime is 31670971. The next prime is 31671019. The reversal of 31670985 is 58907613.

It is not a de Polignac number, because 31670985 - 2⁶ = 31670921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9429 + ... + 12338.

It is an arithmetic number, because the mean of its divisors is an integer number (3199896).

Almost surely, 2^31670985 is an apocalyptic number.

It is an amenable number.

31670985 is a deficient number, since it is larger than the sum of its proper divisors (19527351).

31670985 is a wasteful number, since it uses less digits than its factorization.

31670985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21872.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 31670985 is about 5627.6980196169. The cubic root of 31670985 is about 316.3883790882.

The spelling of 31670985 in words is "thirty-one million, six hundred seventy thousand, nine hundred eighty-five".