31938861 has 4 divisors (see below), whose sum is σ = 42585152. Its totient is φ = 21292572.

The previous prime is 31938857. The next prime is 31938911. The reversal of 31938861 is 16883913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31938861 - 2² = 31938857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31938811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5323141 + ... + 5323146.

It is an arithmetic number, because the mean of its divisors is an integer number (10646288).

Almost surely, 2^31938861 is an apocalyptic number.

It is an amenable number.

31938861 is a deficient number, since it is larger than the sum of its proper divisors (10646291).

31938861 is a wasteful number, since it uses less digits than its factorization.

31938861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646290.

The product of its digits is 31104, while the sum is 39.

The square root of 31938861 is about 5651.4476906364. The cubic root of 31938861 is about 317.2778895860.

The spelling of 31938861 in words is "thirty-one million, nine hundred thirty-eight thousand, eight hundred sixty-one".