320331997 has 4 divisors (see below), whose sum is σ = 320513440. Its totient is φ = 320150556.

The previous prime is 320331961. The next prime is 320332043. The reversal of 320331997 is 799133023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799133023 = 13 ⋅61471771.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320331997 is a prime.

It is a super-2 number, since 2×320331997² = 205225176604016018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320331917) 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, 88047 + ... + 91612.

It is an arithmetic number, because the mean of its divisors is an integer number (80128360).

Almost surely, 2^320331997 is an apocalyptic number.

It is an amenable number.

320331997 is a deficient number, since it is larger than the sum of its proper divisors (181443).

320331997 is a wasteful number, since it uses less digits than its factorization.

320331997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181442.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 320331997 is about 17897.8210126261. The cubic root of 320331997 is about 684.2268414487.

The spelling of 320331997 in words is "three hundred twenty million, three hundred thirty-one thousand, nine hundred ninety-seven".