320031913 has 4 divisors (see below), whose sum is σ = 333946368. Its totient is φ = 306117460.

The previous prime is 320031889. The next prime is 320031917. The reversal of 320031913 is 319130023.

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: 319130023 = 19 ⋅16796317.

It is a cyclic number.

It is not a de Polignac number, because 320031913 - 2⁹ = 320031401 is a prime.

It is a super-3 number, since 3×320031913³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320031917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6957193 + ... + 6957238.

It is an arithmetic number, because the mean of its divisors is an integer number (83486592).

Almost surely, 2^320031913 is an apocalyptic number.

It is an amenable number.

320031913 is a deficient number, since it is larger than the sum of its proper divisors (13914455).

320031913 is a wasteful number, since it uses less digits than its factorization.

320031913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13914454.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 320031913 is about 17889.4357932272. The cubic root of 320031913 is about 684.0131156075.

Adding to 320031913 its reverse (319130023), we get a palindrome (639161936).

The spelling of 320031913 in words is "three hundred twenty million, thirty-one thousand, nine hundred thirteen".