805091 has 4 divisors (see below), whose sum is σ = 920112. Its totient is φ = 690072.

The previous prime is 805081. The next prime is 805097. The reversal of 805091 is 190508.

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 805091 - 2⁶ = 805027 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 805091.

It is not an unprimeable number, because it can be changed into a prime (805097) 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, 57500 + ... + 57513.

It is an arithmetic number, because the mean of its divisors is an integer number (230028).

2⁸⁰⁵⁰⁹¹ is an apocalyptic number.

805091 is a deficient number, since it is larger than the sum of its proper divisors (115021).

805091 is a wasteful number, since it uses less digits than its factorization.

805091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115020.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 805091 is about 897.2686331306. The cubic root of 805091 is about 93.0282798338.

Adding to 805091 its reverse (190508), we get a palindrome (995599).

The spelling of 805091 in words is "eight hundred five thousand, ninety-one".