16805869 has 2 divisors, whose sum is σ = 16805870. Its totient is φ = 16805868.

The previous prime is 16805851. The next prime is 16805879. The reversal of 16805869 is 96850861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15015625 + 1790244 = 3875^2 + 1338^2 .

It is a cyclic number.

It is not a de Polignac number, because 16805869 - 2¹¹ = 16803821 is a prime.

It is a super-2 number, since 2×16805869² = 564874465690322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16805839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8402934 + 8402935.

It is an arithmetic number, because the mean of its divisors is an integer number (8402935).

Almost surely, 2^16805869 is an apocalyptic number.

It is an amenable number.

16805869 is a deficient number, since it is larger than the sum of its proper divisors (1).

16805869 is an equidigital number, since it uses as much as digits as its factorization.

16805869 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16805869 is about 4099.4961885578. The cubic root of 16805869 is about 256.1456538074.

The spelling of 16805869 in words is "sixteen million, eight hundred five thousand, eight hundred sixty-nine".