809165 has 16 divisors (see below), whose sum is σ = 1130880. Its totient is φ = 544320.

The previous prime is 809147. The next prime is 809173. The reversal of 809165 is 561908.

809165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 809165 - 2⁶ = 809101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1946 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (70680).

2⁸⁰⁹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

809165 is a deficient number, since it is larger than the sum of its proper divisors (321715).

809165 is a wasteful number, since it uses less digits than its factorization.

809165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 809165 is about 899.5359914978. The cubic root of 809165 is about 93.1849328182.

The spelling of 809165 in words is "eight hundred nine thousand, one hundred sixty-five".