811089 has 6 divisors (see below), whose sum is σ = 1171586. Its totient is φ = 540720.

The previous prime is 811081. The next prime is 811099. The reversal of 811089 is 980118.

It can be written as a sum of positive squares in only one way, i.e., 810000 + 1089 = 900^2 + 33^2 .

It is not a de Polignac number, because 811089 - 2³ = 811081 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 (811081) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 45052 + ... + 45069.

2⁸¹¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

811089 is a deficient number, since it is larger than the sum of its proper divisors (360497).

811089 is a wasteful number, since it uses less digits than its factorization.

811089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90127 (or 90124 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 811089 is about 900.6047967894. The cubic root of 811089 is about 93.2587314860.

It can be divided in two parts, 81 and 1089, that multiplied together give a square (88209 = 297²).

The spelling of 811089 in words is "eight hundred eleven thousand, eighty-nine".