31983979 has 4 divisors (see below), whose sum is σ = 32277520. Its totient is φ = 31690440.

The previous prime is 31983949. The next prime is 31983983. The reversal of 31983979 is 97938913.

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 31983979 - 2¹¹ = 31981931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31983929) 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, 146607 + ... + 146824.

It is an arithmetic number, because the mean of its divisors is an integer number (8069380).

Almost surely, 2^31983979 is an apocalyptic number.

31983979 is a deficient number, since it is larger than the sum of its proper divisors (293541).

31983979 is a wasteful number, since it uses less digits than its factorization.

31983979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293540.

The product of its digits is 367416, while the sum is 49.

The square root of 31983979 is about 5655.4380024893. The cubic root of 31983979 is about 317.4272187319.

The spelling of 31983979 in words is "thirty-one million, nine hundred eighty-three thousand, nine hundred seventy-nine".