320431513 has 4 divisors (see below), whose sum is σ = 322553728. Its totient is φ = 318309300.

The previous prime is 320431511. The next prime is 320431567. The reversal of 320431513 is 315134023.

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.

It is a cyclic number.

It is not a de Polignac number, because 320431513 - 2¹ = 320431511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320431511) 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, 1060881 + ... + 1061182.

It is an arithmetic number, because the mean of its divisors is an integer number (80638432).

Almost surely, 2^320431513 is an apocalyptic number.

It is an amenable number.

320431513 is a deficient number, since it is larger than the sum of its proper divisors (2122215).

320431513 is a wasteful number, since it uses less digits than its factorization.

320431513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122214.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 320431513 is about 17900.6009117013. The cubic root of 320431513 is about 684.2976892660.

Adding to 320431513 its reverse (315134023), we get a palindrome (635565536).

The spelling of 320431513 in words is "three hundred twenty million, four hundred thirty-one thousand, five hundred thirteen".