16856501 has 2 divisors, whose sum is σ = 16856502. Its totient is φ = 16856500.

The previous prime is 16856443. The next prime is 16856513. The reversal of 16856501 is 10565861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 5476 = 4105^2 + 74^2 .

It is an emirp because it is prime and its reverse (10565861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16856501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16856101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8428250 + 8428251.

It is an arithmetic number, because the mean of its divisors is an integer number (8428251).

Almost surely, 2^16856501 is an apocalyptic number.

It is an amenable number.

16856501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16856501 is an equidigital number, since it uses as much as digits as its factorization.

16856501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 16856501 is about 4105.6669372953. Note that the first 3 decimals coincide. The cubic root of 16856501 is about 256.4026307834.

The spelling of 16856501 in words is "sixteen million, eight hundred fifty-six thousand, five hundred one".