891117 has 6 divisors (see below), whose sum is σ = 1287182. Its totient is φ = 594072.

The previous prime is 891103. The next prime is 891133. The reversal of 891117 is 711198.

It can be written as a sum of positive squares in only one way, i.e., 447561 + 443556 = 669^2 + 666^2 .

It is not a de Polignac number, because 891117 - 2⁴ = 891101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49498 + ... + 49515.

2⁸⁹¹¹¹⁷ is an apocalyptic number.

It is an amenable number.

891117 is a deficient number, since it is larger than the sum of its proper divisors (396065).

891117 is a wasteful number, since it uses less digits than its factorization.

891117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99019 (or 99016 counting only the distinct ones).

The product of its digits is 504, while the sum is 27.

The square root of 891117 is about 943.9899363870. The cubic root of 891117 is about 96.2302416293.

It can be divided in two parts, 8 and 91117, that added together give a cube (91125 = 45³).

The spelling of 891117 in words is "eight hundred ninety-one thousand, one hundred seventeen".