16856513 has 2 divisors, whose sum is σ = 16856514. Its totient is φ = 16856512.

The previous prime is 16856501. The next prime is 16856527. The reversal of 16856513 is 31565861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 21904 = 4103^2 + 148^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16856513 is a prime.

It is not a weakly prime, because it can be changed into another prime (16856533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8428256 + 8428257.

It is an arithmetic number, because the mean of its divisors is an integer number (8428257).

Almost surely, 2^16856513 is an apocalyptic number.

It is an amenable number.

16856513 is a deficient number, since it is larger than the sum of its proper divisors (1).

16856513 is an equidigital number, since it uses as much as digits as its factorization.

16856513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 16856513 is about 4105.6683986898. The cubic root of 16856513 is about 256.4026916270.

The spelling of 16856513 in words is "sixteen million, eight hundred fifty-six thousand, five hundred thirteen".