809105 has 16 divisors (see below), whose sum is σ = 1085184. Its totient is φ = 574080.

The previous prime is 809101. The next prime is 809141. The reversal of 809105 is 501908.

It is not a de Polignac number, because 809105 - 2² = 809101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2429 + ... + 2741.

It is an arithmetic number, because the mean of its divisors is an integer number (67824).

2⁸⁰⁹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

809105 is a deficient number, since it is larger than the sum of its proper divisors (276079).

809105 is a wasteful number, since it uses less digits than its factorization.

809105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376.

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

The square root of 809105 is about 899.5026403519. The cubic root of 809105 is about 93.1826295244.

It can be divided in two parts, 80910 and 5, that multiplied together give a triangular number (404550 = T₈₉₉).

The spelling of 809105 in words is "eight hundred nine thousand, one hundred five".