320344013 has 4 divisors (see below), whose sum is σ = 349466208. Its totient is φ = 291221820.

The previous prime is 320343967. The next prime is 320344051. The reversal of 320344013 is 310443023.

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: 310443023 = 11 ⋅28222093.

It is a cyclic number.

It is not a de Polignac number, because 320344013 - 2²⁴ = 303566797 is a prime.

It is a super-3 number, since 3×320344013³ (a number of 26 digits) contains 333 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 (320344093) 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, 14561081 + ... + 14561102.

It is an arithmetic number, because the mean of its divisors is an integer number (87366552).

Almost surely, 2^320344013 is an apocalyptic number.

It is an amenable number.

320344013 is a deficient number, since it is larger than the sum of its proper divisors (29122195).

320344013 is a wasteful number, since it uses less digits than its factorization.

320344013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29122194.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 320344013 is about 17898.1566927994. The cubic root of 320344013 is about 684.2353967049.

Adding to 320344013 its reverse (310443023), we get a palindrome (630787036).

The spelling of 320344013 in words is "three hundred twenty million, three hundred forty-four thousand, thirteen".