31924979 has 2 divisors, whose sum is σ = 31924980. Its totient is φ = 31924978.

The previous prime is 31924957. The next prime is 31924999. The reversal of 31924979 is 97942913.

It is a strong prime.

It is an emirp because it is prime and its reverse (97942913) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31924979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31924909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15962489 + 15962490.

It is an arithmetic number, because the mean of its divisors is an integer number (15962490).

Almost surely, 2^31924979 is an apocalyptic number.

31924979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31924979 is an equidigital number, since it uses as much as digits as its factorization.

31924979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 31924979 is about 5650.2193762720. The cubic root of 31924979 is about 317.2319153945.

The spelling of 31924979 in words is "thirty-one million, nine hundred twenty-four thousand, nine hundred seventy-nine".