320500217 has 4 divisors (see below), whose sum is σ = 322466640. Its totient is φ = 318533796.

The previous prime is 320500181. The next prime is 320500231. The reversal of 320500217 is 712005023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712005023 = 37 ⋅19243379.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320500217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320500247) 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, 982967 + ... + 983292.

It is an arithmetic number, because the mean of its divisors is an integer number (80616660).

Almost surely, 2^320500217 is an apocalyptic number.

It is an amenable number.

320500217 is a deficient number, since it is larger than the sum of its proper divisors (1966423).

320500217 is a wasteful number, since it uses less digits than its factorization.

320500217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966422.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 320500217 is about 17902.5198505685. The cubic root of 320500217 is about 684.3465927256.

The spelling of 320500217 in words is "three hundred twenty million, five hundred thousand, two hundred seventeen".