31217994 has 32 divisors (see below), whose sum is σ = 69632640. Its totient is φ = 10367136.

The previous prime is 31217987. The next prime is 31218017. The reversal of 31217994 is 49971213.

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, 15979 + ... + 17825.

It is an arithmetic number, because the mean of its divisors is an integer number (2176020).

Almost surely, 2^31217994 is an apocalyptic number.

31217994 is an abundant number, since it is smaller than the sum of its proper divisors (38414646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31217994 is a wasteful number, since it uses less digits than its factorization.

31217994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171 (or 2165 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 31217994 is about 5587.3065067168. The cubic root of 31217994 is about 314.8726923195.

The spelling of 31217994 in words is "thirty-one million, two hundred seventeen thousand, nine hundred ninety-four".