809022689 has 4 divisors (see below), whose sum is σ = 809501124. Its totient is φ = 808544256.

The previous prime is 809022661. The next prime is 809022737. The reversal of 809022689 is 986220908.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 645566464 + 163456225 = 25408^2 + 12785^2 .

It is a cyclic number.

It is not a de Polignac number, because 809022689 - 2²⁴ = 792245473 is a prime.

It is a super-2 number, since 2×809022689² = 1309035422633581442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (809022659) 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 in 3 ways as a sum of consecutive naturals, for example, 236672 + ... + 240065.

It is an arithmetic number, because the mean of its divisors is an integer number (202375281).

Almost surely, 2^809022689 is an apocalyptic number.

It is an amenable number.

809022689 is a deficient number, since it is larger than the sum of its proper divisors (478435).

809022689 is a wasteful number, since it uses less digits than its factorization.

809022689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478434.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 809022689 is about 28443.3241552390. The cubic root of 809022689 is about 931.7946956557.

The spelling of 809022689 in words is "eight hundred nine million, twenty-two thousand, six hundred eighty-nine".