320587217 has 2 divisors, whose sum is σ = 320587218. Its totient is φ = 320587216.

The previous prime is 320587153. The next prime is 320587273. The reversal of 320587217 is 712785023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 296390656 + 24196561 = 17216^2 + 4919^2 .

It is a cyclic number.

It is not a de Polignac number, because 320587217 - 2⁶ = 320587153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320584217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160293608 + 160293609.

It is an arithmetic number, because the mean of its divisors is an integer number (160293609).

Almost surely, 2^320587217 is an apocalyptic number.

It is an amenable number.

320587217 is a deficient number, since it is larger than the sum of its proper divisors (1).

320587217 is an equidigital number, since it uses as much as digits as its factorization.

320587217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 320587217 is about 17904.9495112385. The cubic root of 320587217 is about 684.4085092382.

The spelling of 320587217 in words is "three hundred twenty million, five hundred eighty-seven thousand, two hundred seventeen".