891123 has 16 divisors (see below), whose sum is σ = 1277856. Its totient is φ = 550400.

The previous prime is 891103. The next prime is 891133. The reversal of 891123 is 321198.

It is a cyclic number.

It is not a de Polignac number, because 891123 - 2⁵ = 891091 is a prime.

It is a super-2 number, since 2×891123² = 1588200402258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

891123 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 891093 and 891102.

It is not an unprimeable number, because it can be changed into a prime (891103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5065 + ... + 5237.

It is an arithmetic number, because the mean of its divisors is an integer number (79866).

2⁸⁹¹¹²³ is an apocalyptic number.

891123 is a deficient number, since it is larger than the sum of its proper divisors (386733).

891123 is a wasteful number, since it uses less digits than its factorization.

891123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294.

The product of its digits is 432, while the sum is 24.

The square root of 891123 is about 943.9931143817. The cubic root of 891123 is about 96.2304576055.

The spelling of 891123 in words is "eight hundred ninety-one thousand, one hundred twenty-three".