891189 has 16 divisors (see below), whose sum is σ = 1422400. Its totient is φ = 548208.

The previous prime is 891179. The next prime is 891223. The reversal of 891189 is 981198.

It is not a de Polignac number, because 891189 - 2⁴ = 891173 is a prime.

It is a Duffinian number.

It is a Curzon number.

891189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919 + ... + 1620.

It is an arithmetic number, because the mean of its divisors is an integer number (88900).

2⁸⁹¹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

891189 is a deficient number, since it is larger than the sum of its proper divisors (531211).

891189 is a wasteful number, since it uses less digits than its factorization.

891189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561 (or 2555 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 891189 is about 944.0280716165. The cubic root of 891189 is about 96.2328332796.

Subtracting 891189 from its reverse (981198), we obtain a palindrome (90009).

The spelling of 891189 in words is "eight hundred ninety-one thousand, one hundred eighty-nine".