320311321 has 12 divisors (see below), whose sum is σ = 352822932. Its totient is φ = 290576000.

The previous prime is 320311319. The next prime is 320311333. The reversal of 320311321 is 123113023.

It can be written as a sum of positive squares in 2 ways, for example, as 66259600 + 254051721 = 8140^2 + 15939^2 .

It is not a de Polignac number, because 320311321 - 2¹ = 320311319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320311295 and 320311304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320311021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60501 + ... + 65581.

It is an arithmetic number, because the mean of its divisors is an integer number (29401911).

Almost surely, 2^320311321 is an apocalyptic number.

It is an amenable number.

320311321 is a deficient number, since it is larger than the sum of its proper divisors (32511611).

320311321 is a wasteful number, since it uses less digits than its factorization.

320311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624 (or 5613 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 320311321 is about 17897.2433910924. The cubic root of 320311321 is about 684.2121198695.

Adding to 320311321 its reverse (123113023), we get a palindrome (443424344).

The spelling of 320311321 in words is "three hundred twenty million, three hundred eleven thousand, three hundred twenty-one".