320956865 has 4 divisors (see below), whose sum is σ = 385148244. Its totient is φ = 256765488.

The previous prime is 320956841. The next prime is 320956901. The reversal of 320956865 is 568659023.

It is a happy number.

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 217385536 + 103571329 = 14744^2 + 10177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320956865 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32095682 + ... + 32095691.

It is an arithmetic number, because the mean of its divisors is an integer number (96287061).

Almost surely, 2^320956865 is an apocalyptic number.

It is an amenable number.

320956865 is a deficient number, since it is larger than the sum of its proper divisors (64191379).

320956865 is an equidigital number, since it uses as much as digits as its factorization.

320956865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64191378.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 320956865 is about 17915.2690462633. The cubic root of 320956865 is about 684.6714569895.

The spelling of 320956865 in words is "three hundred twenty million, nine hundred fifty-six thousand, eight hundred sixty-five".