891113 has 4 divisors (see below), whose sum is σ = 893508. Its totient is φ = 888720.

The previous prime is 891103. The next prime is 891133. The reversal of 891113 is 311198.

891113 = 667² + 668².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311198 = 2 ⋅155599.

It can be written as a sum of positive squares in 2 ways, for example, as 446224 + 444889 = 668^2 + 667^2 .

It is a cyclic number.

It is not a de Polignac number, because 891113 - 2⁶ = 891049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891103) 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 3 ways as a sum of consecutive naturals, for example, 506 + ... + 1427.

It is an arithmetic number, because the mean of its divisors is an integer number (223377).

2⁸⁹¹¹¹³ is an apocalyptic number.

891113 is the 668-th centered square number.

It is an amenable number.

891113 is a deficient number, since it is larger than the sum of its proper divisors (2395).

891113 is a wasteful number, since it uses less digits than its factorization.

891113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394.

The product of its digits is 216, while the sum is 23.

The square root of 891113 is about 943.9878177180. The cubic root of 891113 is about 96.2300976446.

Adding to 891113 its sum of digits (23), we get a square (891136 = 944²).

The spelling of 891113 in words is "eight hundred ninety-one thousand, one hundred thirteen".