320320331 has 4 divisors (see below), whose sum is σ = 328133064. Its totient is φ = 312507600.

The previous prime is 320320327. The next prime is 320320337. The reversal of 320320331 is 133023023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133023023 = 7 ⋅19003289.

It is a cyclic number.

It is not a de Polignac number, because 320320331 - 2² = 320320327 is a prime.

It is a super-2 number, since 2×320320331² = 205210228903899122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320320337) 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, 3906305 + ... + 3906386.

It is an arithmetic number, because the mean of its divisors is an integer number (82033266).

Almost surely, 2^320320331 is an apocalyptic number.

320320331 is a deficient number, since it is larger than the sum of its proper divisors (7812733).

320320331 is an equidigital number, since it uses as much as digits as its factorization.

320320331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7812732.

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 320320331 is about 17897.4951040641. The cubic root of 320320331 is about 684.2185351838.

Adding to 320320331 its reverse (133023023), we get a palindrome (453343354).

The spelling of 320320331 in words is "three hundred twenty million, three hundred twenty thousand, three hundred thirty-one".