320290931 has 16 divisors (see below), whose sum is σ = 349495488. Its totient is φ = 292377600.

The previous prime is 320290921. The next prime is 320290937. The reversal of 320290931 is 139092023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320290931 is a prime.

It is a super-2 number, since 2×320290931² = 205172560961693522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320290894 and 320290903.

It is not an unprimeable number, because it can be changed into a prime (320290937) 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 in 15 ways as a sum of consecutive naturals, for example, 73586 + ... + 77816.

It is an arithmetic number, because the mean of its divisors is an integer number (21843468).

Almost surely, 2^320290931 is an apocalyptic number.

320290931 is a deficient number, since it is larger than the sum of its proper divisors (29204557).

320290931 is a wasteful number, since it uses less digits than its factorization.

320290931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 320290931 is about 17896.6737412291. The cubic root of 320290931 is about 684.1976013056.

The spelling of 320290931 in words is "three hundred twenty million, two hundred ninety thousand, nine hundred thirty-one".