16809769 has 2 divisors, whose sum is σ = 16809770. Its totient is φ = 16809768.

The previous prime is 16809739. The next prime is 16809791. The reversal of 16809769 is 96790861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16104169 + 705600 = 4013^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 16809769 - 2⁷ = 16809641 is a prime.

It is a super-2 number, since 2×16809769² = 565136667666722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16809739) 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, 8404884 + 8404885.

It is an arithmetic number, because the mean of its divisors is an integer number (8404885).

Almost surely, 2^16809769 is an apocalyptic number.

It is an amenable number.

16809769 is a deficient number, since it is larger than the sum of its proper divisors (1).

16809769 is an equidigital number, since it uses as much as digits as its factorization.

16809769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 16809769 is about 4099.9718291715. The cubic root of 16809769 is about 256.1654661477.

It can be divided in two parts, 16809 and 769, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 16809769 in words is "sixteen million, eight hundred nine thousand, seven hundred sixty-nine".