31973109 has 16 divisors (see below), whose sum is σ = 50401920. Its totient is φ = 17640000.

The previous prime is 31973101. The next prime is 31973111. The reversal of 31973109 is 90137913.

It is not a de Polignac number, because 31973109 - 2³ = 31973101 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31973109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31973101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25642 + ... + 26859.

It is an arithmetic number, because the mean of its divisors is an integer number (3150120).

Almost surely, 2^31973109 is an apocalyptic number.

It is an amenable number.

31973109 is a deficient number, since it is larger than the sum of its proper divisors (18428811).

31973109 is a wasteful number, since it uses less digits than its factorization.

31973109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52540.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 31973109 is about 5654.4768988829. The cubic root of 31973109 is about 317.3912546343.

The spelling of 31973109 in words is "thirty-one million, nine hundred seventy-three thousand, one hundred nine".