31959979 has 4 divisors (see below), whose sum is σ = 31974480. Its totient is φ = 31945480.

The previous prime is 31959947. The next prime is 31960021. The reversal of 31959979 is 97995913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31959979 - 2⁵ = 31959947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31959929) 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 3 ways as a sum of consecutive naturals, for example, 3184 + ... + 8605.

It is an arithmetic number, because the mean of its divisors is an integer number (7993620).

Almost surely, 2^31959979 is an apocalyptic number.

31959979 is a deficient number, since it is larger than the sum of its proper divisors (14501).

31959979 is a wasteful number, since it uses less digits than its factorization.

31959979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14500.

The product of its digits is 688905, while the sum is 52.

The square root of 31959979 is about 5653.3157527242. The cubic root of 31959979 is about 317.3478023095.

The spelling of 31959979 in words is "thirty-one million, nine hundred fifty-nine thousand, nine hundred seventy-nine".