31938113 has 4 divisors (see below), whose sum is σ = 31951920. Its totient is φ = 31924308.

The previous prime is 31938097. The next prime is 31938149. The reversal of 31938113 is 31183913.

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 a cyclic number.

It is not a de Polignac number, because 31938113 - 2⁴ = 31938097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31938173) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2495 + ... + 8372.

It is an arithmetic number, because the mean of its divisors is an integer number (7987980).

Almost surely, 2^31938113 is an apocalyptic number.

It is an amenable number.

31938113 is a deficient number, since it is larger than the sum of its proper divisors (13807).

31938113 is a wasteful number, since it uses less digits than its factorization.

31938113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13806.

The product of its digits is 1944, while the sum is 29.

The square root of 31938113 is about 5651.3815125153. The cubic root of 31938113 is about 317.2754127109.

The spelling of 31938113 in words is "thirty-one million, nine hundred thirty-eight thousand, one hundred thirteen".