320540313 has 4 divisors (see below), whose sum is σ = 427387088. Its totient is φ = 213693540.

The previous prime is 320540309. The next prime is 320540323. The reversal of 320540313 is 313045023.

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 not a de Polignac number, because 320540313 - 2² = 320540309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320540313.

It is not an unprimeable number, because it can be changed into a prime (320540323) 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, 53423383 + ... + 53423388.

It is an arithmetic number, because the mean of its divisors is an integer number (106846772).

Almost surely, 2^320540313 is an apocalyptic number.

It is an amenable number.

320540313 is a deficient number, since it is larger than the sum of its proper divisors (106846775).

320540313 is a wasteful number, since it uses less digits than its factorization.

320540313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106846774.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 320540313 is about 17903.6396579020. The cubic root of 320540313 is about 684.3751298013.

Adding to 320540313 its reverse (313045023), we get a palindrome (633585336).

The spelling of 320540313 in words is "three hundred twenty million, five hundred forty thousand, three hundred thirteen".