811105 has 4 divisors (see below), whose sum is σ = 973332. Its totient is φ = 648880.

The previous prime is 811099. The next prime is 811123. The reversal of 811105 is 501118.

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

It can be written as a sum of positive squares in 2 ways, for example, as 431649 + 379456 = 657^2 + 616^2 .

It is not a de Polignac number, because 811105 - 2¹³ = 802913 is a prime.

It is a Duffinian number.

811105 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81106 + ... + 81115.

It is an arithmetic number, because the mean of its divisors is an integer number (243333).

2⁸¹¹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

811105 is a deficient number, since it is larger than the sum of its proper divisors (162227).

811105 is a wasteful number, since it uses less digits than its factorization.

811105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162226.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 811105 is about 900.6136796651. The cubic root of 811105 is about 93.2593447068.

The spelling of 811105 in words is "eight hundred eleven thousand, one hundred five".