809189 has 2 divisors, whose sum is σ = 809190. Its totient is φ = 809188.

The previous prime is 809177. The next prime is 809201. The reversal of 809189 is 981908.

It is a happy number.

809189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (809177) and next prime (809201).

It can be written as a sum of positive squares in only one way, i.e., 588289 + 220900 = 767^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 809189 - 2⁴ = 809173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (802189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404594 + 404595.

It is an arithmetic number, because the mean of its divisors is an integer number (404595).

2⁸⁰⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

809189 is a deficient number, since it is larger than the sum of its proper divisors (1).

809189 is an equidigital number, since it uses as much as digits as its factorization.

809189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 809189 is about 899.5493316100. The cubic root of 809189 is about 93.1858541039.

The spelling of 809189 in words is "eight hundred nine thousand, one hundred eighty-nine".