16856089 has 2 divisors, whose sum is σ = 16856090. Its totient is φ = 16856088.

The previous prime is 16856071. The next prime is 16856101. The reversal of 16856089 is 98065861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 1646089 = 3900^2 + 1283^2 .

It is a cyclic number.

It is not a de Polignac number, because 16856089 - 2²¹ = 14758937 is a prime.

It is not a weakly prime, because it can be changed into another prime (16856009) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8428044 + 8428045.

It is an arithmetic number, because the mean of its divisors is an integer number (8428045).

Almost surely, 2^16856089 is an apocalyptic number.

It is an amenable number.

16856089 is a deficient number, since it is larger than the sum of its proper divisors (1).

16856089 is an equidigital number, since it uses as much as digits as its factorization.

16856089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 16856089 is about 4105.6167624366. The cubic root of 16856089 is about 256.4005418021.

The spelling of 16856089 in words is "sixteen million, eight hundred fifty-six thousand, eighty-nine".