891137 has 6 divisors (see below), whose sum is σ = 965142. Its totient is φ = 822432.

The previous prime is 891133. The next prime is 891151. The reversal of 891137 is 731198.

It is a Cunningham number, because it is equal to 944²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 891136 = 1^2 + 944^2 .

It is not a de Polignac number, because 891137 - 2² = 891133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 891137.

It is not an unprimeable number, because it can be changed into a prime (891133) 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, 2468 + ... + 2805.

It is an arithmetic number, because the mean of its divisors is an integer number (160857).

2⁸⁹¹¹³⁷ is an apocalyptic number.

It is an amenable number.

891137 is a deficient number, since it is larger than the sum of its proper divisors (74005).

891137 is a wasteful number, since it uses less digits than its factorization.

891137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299 (or 5286 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 891137 is about 944.0005296609. Note that the first 3 decimals coincide. The cubic root of 891137 is about 96.2309615461.

The spelling of 891137 in words is "eight hundred ninety-one thousand, one hundred thirty-seven".