320643959 has 4 divisors (see below), whose sum is σ = 325036416. Its totient is φ = 316251504.

The previous prime is 320643931. The next prime is 320643997. The reversal of 320643959 is 959346023.

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

It is a cyclic number.

It is not a de Polignac number, because 320643959 - 2⁸ = 320643703 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 (320643929) 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, 2196119 + ... + 2196264.

It is an arithmetic number, because the mean of its divisors is an integer number (81259104).

Almost surely, 2^320643959 is an apocalyptic number.

320643959 is a deficient number, since it is larger than the sum of its proper divisors (4392457).

320643959 is an equidigital number, since it uses as much as digits as its factorization.

320643959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392456.

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 320643959 is about 17906.5339750606. The cubic root of 320643959 is about 684.4488855795.

The spelling of 320643959 in words is "three hundred twenty million, six hundred forty-three thousand, nine hundred fifty-nine".