891161 has 2 divisors, whose sum is σ = 891162. Its totient is φ = 891160.

The previous prime is 891151. The next prime is 891173. The reversal of 891161 is 161198.

891161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 891136 + 25 = 944^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 891161 - 2¹⁴ = 874777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891161.

It is not a weakly prime, because it can be changed into another prime (891101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445580 + 445581.

It is an arithmetic number, because the mean of its divisors is an integer number (445581).

2⁸⁹¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

891161 is a deficient number, since it is larger than the sum of its proper divisors (1).

891161 is an equidigital number, since it uses as much as digits as its factorization.

891161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 891161 is about 944.0132414326. The cubic root of 891161 is about 96.2318254321.

The spelling of 891161 in words is "eight hundred ninety-one thousand, one hundred sixty-one".