809311 has 4 divisors (see below), whose sum is σ = 811512. Its totient is φ = 807112.

The previous prime is 809309. The next prime is 809323. The reversal of 809311 is 113908.

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

It is a cyclic number.

It is not a de Polignac number, because 809311 - 2¹ = 809309 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 (800311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (202878).

2⁸⁰⁹³¹¹ is an apocalyptic number.

809311 is a deficient number, since it is larger than the sum of its proper divisors (2201).

809311 is a wasteful number, since it uses less digits than its factorization.

809311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 809311 is about 899.6171407882. The cubic root of 809311 is about 93.1905370242.

The spelling of 809311 in words is "eight hundred nine thousand, three hundred eleven".