31968621 has 32 divisors (see below), whose sum is σ = 50428800. Its totient is φ = 19958400.

The previous prime is 31968613. The next prime is 31968631. The reversal of 31968621 is 12686913.

It is not a de Polignac number, because 31968621 - 2³ = 31968613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31968631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51505 + ... + 52121.

It is an arithmetic number, because the mean of its divisors is an integer number (1575900).

Almost surely, 2^31968621 is an apocalyptic number.

It is an amenable number.

31968621 is a deficient number, since it is larger than the sum of its proper divisors (18460179).

31968621 is a wasteful number, since it uses less digits than its factorization.

31968621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 740 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 31968621 is about 5654.0800312695. The cubic root of 31968621 is about 317.3764034187.

The spelling of 31968621 in words is "thirty-one million, nine hundred sixty-eight thousand, six hundred twenty-one".