16855417 has 2 divisors, whose sum is σ = 16855418. Its totient is φ = 16855416.

The previous prime is 16855393. The next prime is 16855427. The reversal of 16855417 is 71455861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9369721 + 7485696 = 3061^2 + 2736^2 .

It is an emirp because it is prime and its reverse (71455861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16855417 is a prime.

It is not a weakly prime, because it can be changed into another prime (16855427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8427708 + 8427709.

It is an arithmetic number, because the mean of its divisors is an integer number (8427709).

Almost surely, 2^16855417 is an apocalyptic number.

It is an amenable number.

16855417 is a deficient number, since it is larger than the sum of its proper divisors (1).

16855417 is an equidigital number, since it uses as much as digits as its factorization.

16855417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 16855417 is about 4105.5349225162. The cubic root of 16855417 is about 256.3971344587.

The spelling of 16855417 in words is "sixteen million, eight hundred fifty-five thousand, four hundred seventeen".