320513005 has 4 divisors (see below), whose sum is σ = 384615612. Its totient is φ = 256410400.

The previous prime is 320513003. The next prime is 320513021. The reversal of 320513005 is 500315023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 210221001 + 110292004 = 14499^2 + 10502^2 .

It is not a de Polignac number, because 320513005 - 2¹ = 320513003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320513003) 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, 32051296 + ... + 32051305.

It is an arithmetic number, because the mean of its divisors is an integer number (96153903).

Almost surely, 2^320513005 is an apocalyptic number.

It is an amenable number.

320513005 is a deficient number, since it is larger than the sum of its proper divisors (64102607).

320513005 is an equidigital number, since it uses as much as digits as its factorization.

320513005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64102606.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 320513005 is about 17902.8770034316. The cubic root of 320513005 is about 684.3556944437.

Adding to 320513005 its reverse (500315023), we get a palindrome (820828028).

The spelling of 320513005 in words is "three hundred twenty million, five hundred thirteen thousand, five".