16856901 has 18 divisors (see below), whose sum is σ = 25172550. Its totient is φ = 10869840.

The previous prime is 16856897. The next prime is 16856921. The reversal of 16856901 is 10965861.

It can be written as a sum of positive squares in only one way, i.e., 15992001 + 864900 = 3999^2 + 930^2 .

It is not a de Polignac number, because 16856901 - 2² = 16856897 is a prime.

It is a super-2 number, since 2×16856901² = 568310222647602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16856921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7675 + ... + 9623.

It is an arithmetic number, because the mean of its divisors is an integer number (1398475).

Almost surely, 2^16856901 is an apocalyptic number.

It is an amenable number.

16856901 is a deficient number, since it is larger than the sum of its proper divisors (8315649).

16856901 is a wasteful number, since it uses less digits than its factorization.

16856901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 16856901 is about 4105.7156501638. The cubic root of 16856901 is about 256.4046588880.

The spelling of 16856901 in words is "sixteen million, eight hundred fifty-six thousand, nine hundred one".