16855317 has 8 divisors (see below), whose sum is σ = 24970880. Its totient is φ = 11236860.

The previous prime is 16855309. The next prime is 16855331. The reversal of 16855317 is 71355861.

It is not a de Polignac number, because 16855317 - 2³ = 16855309 is a prime.

It is a super-2 number, since 2×16855317² = 568203422340978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16855357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312109 + ... + 312162.

It is an arithmetic number, because the mean of its divisors is an integer number (3121360).

Almost surely, 2^16855317 is an apocalyptic number.

It is an amenable number.

16855317 is a deficient number, since it is larger than the sum of its proper divisors (8115563).

16855317 is an equidigital number, since it uses as much as digits as its factorization.

16855317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624280 (or 624274 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 16855317 is about 4105.5227438172. The cubic root of 16855317 is about 256.3966274058.

The spelling of 16855317 in words is "sixteen million, eight hundred fifty-five thousand, three hundred seventeen".