809273221 has 4 divisors (see below), whose sum is σ = 809334592. Its totient is φ = 809211852.

The previous prime is 809273209. The next prime is 809273249. The reversal of 809273221 is 122372908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 809273221 - 2⁷ = 809273093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809273261) 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, 1911 + ... + 40276.

It is an arithmetic number, because the mean of its divisors is an integer number (202333648).

Almost surely, 2^809273221 is an apocalyptic number.

It is an amenable number.

809273221 is a deficient number, since it is larger than the sum of its proper divisors (61371).

809273221 is a wasteful number, since it uses less digits than its factorization.

809273221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61370.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 809273221 is about 28447.7278706051. The cubic root of 809273221 is about 931.8908694297.

It can be divided in two parts, 80927 and 3221, that added together give a palindrome (84148).

The spelling of 809273221 in words is "eight hundred nine million, two hundred seventy-three thousand, two hundred twenty-one".