320809917 has 16 divisors (see below), whose sum is σ = 444274688. Its totient is φ = 205694640.

The previous prime is 320809913. The next prime is 320809933. The reversal of 320809917 is 719908023.

It is not a de Polignac number, because 320809917 - 2² = 320809913 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 (320809913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4578 + ... + 25740.

It is an arithmetic number, because the mean of its divisors is an integer number (27767168).

Almost surely, 2^320809917 is an apocalyptic number.

It is an amenable number.

320809917 is a deficient number, since it is larger than the sum of its proper divisors (123464771).

320809917 is a wasteful number, since it uses less digits than its factorization.

320809917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21360.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 320809917 is about 17911.1673823902. The cubic root of 320809917 is about 684.5669502568.

The spelling of 320809917 in words is "three hundred twenty million, eight hundred nine thousand, nine hundred seventeen".