31661944 has 8 divisors (see below), whose sum is σ = 59366160. Its totient is φ = 15830968.

The previous prime is 31661909. The next prime is 31661957. The reversal of 31661944 is 44916613.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1978864 + ... + 1978879.

It is an arithmetic number, because the mean of its divisors is an integer number (7420770).

Almost surely, 2^31661944 is an apocalyptic number.

It is an amenable number.

31661944 is a deficient number, since it is larger than the sum of its proper divisors (27704216).

31661944 is a wasteful number, since it uses less digits than its factorization.

31661944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3957749 (or 3957745 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 31661944 is about 5626.8947031200. The cubic root of 31661944 is about 316.3582701460.

The spelling of 31661944 in words is "thirty-one million, six hundred sixty-one thousand, nine hundred forty-four".