319989931 has 2 divisors, whose sum is σ = 319989932. Its totient is φ = 319989930.

The previous prime is 319989907. The next prime is 319989937. The reversal of 319989931 is 139989913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 319989931 - 2⁵ = 319989899 is a prime.

It is a super-2 number, since 2×319989931² = 204787111882769522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (319989937) 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 as a sum of consecutive naturals, namely, 159994965 + 159994966.

It is an arithmetic number, because the mean of its divisors is an integer number (159994966).

Almost surely, 2^319989931 is an apocalyptic number.

319989931 is a deficient number, since it is larger than the sum of its proper divisors (1).

319989931 is an equidigital number, since it uses as much as digits as its factorization.

319989931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 52.

The square root of 319989931 is about 17888.2623806786. The cubic root of 319989931 is about 683.9832045338.

The spelling of 319989931 in words is "three hundred nineteen million, nine hundred eighty-nine thousand, nine hundred thirty-one".