891165 has 24 divisors (see below), whose sum is σ = 1570464. Its totient is φ = 431200.

The previous prime is 891161. The next prime is 891173. The reversal of 891165 is 561198.

It is a happy number.

It is not a de Polignac number, because 891165 - 2² = 891161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891161) 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 23 ways as a sum of consecutive naturals, for example, 1570 + ... + 2060.

It is an arithmetic number, because the mean of its divisors is an integer number (65436).

2⁸⁹¹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

891165 is a deficient number, since it is larger than the sum of its proper divisors (679299).

891165 is a wasteful number, since it uses less digits than its factorization.

891165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 510 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 891165 is about 944.0153600445. The cubic root of 891165 is about 96.2319694116.

The spelling of 891165 in words is "eight hundred ninety-one thousand, one hundred sixty-five".