891155 has 4 divisors (see below), whose sum is σ = 1069392. Its totient is φ = 712920.

The previous prime is 891151. The next prime is 891161. The reversal of 891155 is 551198.

891155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551198 = 2 ⋅275599.

It is not a de Polignac number, because 891155 - 2² = 891151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89111 + ... + 89120.

It is an arithmetic number, because the mean of its divisors is an integer number (267348).

2⁸⁹¹¹⁵⁵ is an apocalyptic number.

891155 is a deficient number, since it is larger than the sum of its proper divisors (178237).

891155 is a wasteful number, since it uses less digits than its factorization.

891155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178236.

The product of its digits is 1800, while the sum is 29.

The square root of 891155 is about 944.0100635057. The cubic root of 891155 is about 96.2316094621.

The spelling of 891155 in words is "eight hundred ninety-one thousand, one hundred fifty-five".