809563231 has 2 divisors, whose sum is σ = 809563232. Its totient is φ = 809563230.

The previous prime is 809563207. The next prime is 809563289. The reversal of 809563231 is 132365908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809563231 - 2²⁹ = 272692319 is a prime.

It is a super-2 number, since 2×809563231² = 1310785249974318722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809563031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404781615 + 404781616.

It is an arithmetic number, because the mean of its divisors is an integer number (404781616).

Almost surely, 2^809563231 is an apocalyptic number.

809563231 is a deficient number, since it is larger than the sum of its proper divisors (1).

809563231 is an equidigital number, since it uses as much as digits as its factorization.

809563231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 809563231 is about 28452.8246576680. The cubic root of 809563231 is about 932.0021731638.

The spelling of 809563231 in words is "eight hundred nine million, five hundred sixty-three thousand, two hundred thirty-one".