319931 has 2 divisors, whose sum is σ = 319932. Its totient is φ = 319930.

The previous prime is 319927. The next prime is 319937. The reversal of 319931 is 139913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 319931 - 2² = 319927 is a prime.

It is a super-2 number, since 2×319931² = 204711689522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 319931.

It is not a weakly prime, because it can be changed into another prime (319937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159965 + 159966.

It is an arithmetic number, because the mean of its divisors is an integer number (159966).

2³¹⁹⁹³¹ is an apocalyptic number.

319931 is a deficient number, since it is larger than the sum of its proper divisors (1).

319931 is an equidigital number, since it uses as much as digits as its factorization.

319931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 729, while the sum is 26.

The square root of 319931 is about 565.6244337014. The cubic root of 319931 is about 68.3941213328.

The spelling of 319931 in words is "three hundred nineteen thousand, nine hundred thirty-one".