31621994 has 16 divisors (see below), whose sum is σ = 48911040. Its totient is φ = 15325920.

The previous prime is 31621981. The next prime is 31622047. The reversal of 31621994 is 49912613.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6779 + ... + 10449.

It is an arithmetic number, because the mean of its divisors is an integer number (3056940).

Almost surely, 2^31621994 is an apocalyptic number.

31621994 is a deficient number, since it is larger than the sum of its proper divisors (17289046).

31621994 is a wasteful number, since it uses less digits than its factorization.

31621994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805.

The product of its digits is 11664, while the sum is 35.

The square root of 31621994 is about 5623.3436672499. The cubic root of 31621994 is about 316.2251573230.

The spelling of 31621994 in words is "thirty-one million, six hundred twenty-one thousand, nine hundred ninety-four".