809065189 has 2 divisors, whose sum is σ = 809065190. Its totient is φ = 809065188.

The previous prime is 809065157. The next prime is 809065237. The reversal of 809065189 is 981560908.

809065189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588305025 + 220760164 = 24255^2 + 14858^2 .

It is a cyclic number.

It is not a de Polignac number, because 809065189 - 2⁵ = 809065157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809065489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404532594 + 404532595.

It is an arithmetic number, because the mean of its divisors is an integer number (404532595).

Almost surely, 2^809065189 is an apocalyptic number.

It is an amenable number.

809065189 is a deficient number, since it is larger than the sum of its proper divisors (1).

809065189 is an equidigital number, since it uses as much as digits as its factorization.

809065189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 809065189 is about 28444.0712451646. The cubic root of 809065189 is about 931.8110118776.

The spelling of 809065189 in words is "eight hundred nine million, sixty-five thousand, one hundred eighty-nine".