809231 has 2 divisors, whose sum is σ = 809232. Its totient is φ = 809230.

The previous prime is 809213. The next prime is 809239. The reversal of 809231 is 132908.

809231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (809213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809231 - 2¹⁸ = 547087 is a prime.

It is a super-2 number, since 2×809231² = 1309709622722, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 809197 and 809206.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 809231.

It is not a weakly prime, because it can be changed into another prime (809239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404615 + 404616.

It is an arithmetic number, because the mean of its divisors is an integer number (404616).

2⁸⁰⁹²³¹ is an apocalyptic number.

809231 is a deficient number, since it is larger than the sum of its proper divisors (1).

809231 is an equidigital number, since it uses as much as digits as its factorization.

809231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 809231 is about 899.5726763303. The cubic root of 809231 is about 93.1874663099.

The spelling of 809231 in words is "eight hundred nine thousand, two hundred thirty-one".