320907217 has 2 divisors, whose sum is σ = 320907218. Its totient is φ = 320907216.

The previous prime is 320907143. The next prime is 320907229. The reversal of 320907217 is 712709023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243484816 + 77422401 = 15604^2 + 8799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320907217 is a prime.

It is not a weakly prime, because it can be changed into another prime (320907277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160453608 + 160453609.

It is an arithmetic number, because the mean of its divisors is an integer number (160453609).

Almost surely, 2^320907217 is an apocalyptic number.

It is an amenable number.

320907217 is a deficient number, since it is larger than the sum of its proper divisors (1).

320907217 is an equidigital number, since it uses as much as digits as its factorization.

320907217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 320907217 is about 17913.8833590040. The cubic root of 320907217 is about 684.6361518077.

The spelling of 320907217 in words is "three hundred twenty million, nine hundred seven thousand, two hundred seventeen".