320321313 has 12 divisors (see below), whose sum is σ = 498277780. Its totient is φ = 197120736.

The previous prime is 320321303. The next prime is 320321317. The reversal of 320321313 is 313123023.

320321313 is a `hidden beast` number, since 32 + 0 + 321 + 313 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 97476129 + 222845184 = 9873^2 + 14928^2 .

It is not a de Polignac number, because 320321313 - 2⁴ = 320321297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320321317) 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, 1368778 + ... + 1369011.

Almost surely, 2^320321313 is an apocalyptic number.

It is an amenable number.

320321313 is a deficient number, since it is larger than the sum of its proper divisors (177956467).

320321313 is a wasteful number, since it uses less digits than its factorization.

320321313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737808 (or 2737805 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 320321313 is about 17897.5225380498. The cubic root of 320321313 is about 684.2192343817.

Adding to 320321313 its reverse (313123023), we get a palindrome (633444336).

The spelling of 320321313 in words is "three hundred twenty million, three hundred twenty-one thousand, three hundred thirteen".