320331313 has 4 divisors (see below), whose sum is σ = 325582708. Its totient is φ = 315079920.

The previous prime is 320331307. The next prime is 320331337. The reversal of 320331313 is 313133023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 137757169 + 182574144 = 11737^2 + 13512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320331313 is a prime.

It is a super-2 number, since 2×320331313² = 205224300176607938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320331413) 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, 2625606 + ... + 2625727.

It is an arithmetic number, because the mean of its divisors is an integer number (81395677).

Almost surely, 2^320331313 is an apocalyptic number.

It is an amenable number.

320331313 is a deficient number, since it is larger than the sum of its proper divisors (5251395).

320331313 is an equidigital number, since it uses as much as digits as its factorization.

320331313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251394.

The product of its (nonzero) digits is 486, while the sum is 19.

The square root of 320331313 is about 17897.8019041445. The cubic root of 320331313 is about 684.2263544420.

Adding to 320331313 its reverse (313133023), we get a palindrome (633464336).

The spelling of 320331313 in words is "three hundred twenty million, three hundred thirty-one thousand, three hundred thirteen".