811889 has 12 divisors (see below), whose sum is σ = 928116. Its totient is φ = 705888.

The previous prime is 811879. The next prime is 811897. The reversal of 811889 is 988118.

811889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 442225 + 369664 = 665^2 + 608^2 .

It is not a de Polignac number, because 811889 - 2¹⁶ = 746353 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4607 + ... + 4779.

It is an arithmetic number, because the mean of its divisors is an integer number (77343).

2⁸¹¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

811889 is a deficient number, since it is larger than the sum of its proper divisors (116227).

811889 is a wasteful number, since it uses less digits than its factorization.

811889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 205 counting only the distinct ones).

The product of its digits is 4608, while the sum is 35.

The square root of 811889 is about 901.0488333048. The cubic root of 811889 is about 93.2893826515.

The spelling of 811889 in words is "eight hundred eleven thousand, eight hundred eighty-nine".