320646331 has 4 divisors (see below), whose sum is σ = 322499952. Its totient is φ = 318792712.

The previous prime is 320646269. The next prime is 320646349. The reversal of 320646331 is 133646023.

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 320646331 - 2⁷ = 320646203 is a prime.

It is a super-2 number, since 2×320646331² = 205628139167523122, which contains 22 as substring.

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 320646331.

It is not an unprimeable number, because it can be changed into a prime (320646371) 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, 926551 + ... + 926896.

It is an arithmetic number, because the mean of its divisors is an integer number (80624988).

Almost surely, 2^320646331 is an apocalyptic number.

320646331 is a deficient number, since it is larger than the sum of its proper divisors (1853621).

320646331 is a wasteful number, since it uses less digits than its factorization.

320646331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853620.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 320646331 is about 17906.6002077446. The cubic root of 320646331 is about 684.4505733381.

The spelling of 320646331 in words is "three hundred twenty million, six hundred forty-six thousand, three hundred thirty-one".