891169 has 4 divisors (see below), whose sum is σ = 897300. Its totient is φ = 885040.

The previous prime is 891161. The next prime is 891173. The reversal of 891169 is 961198.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57600 + 833569 = 240^2 + 913^2 .

It is a cyclic number.

It is not a de Polignac number, because 891169 - 2³ = 891161 is a prime.

It is a super-2 number, since 2×891169² = 1588364373122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (891161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2842 + ... + 3139.

It is an arithmetic number, because the mean of its divisors is an integer number (224325).

2⁸⁹¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

891169 is a deficient number, since it is larger than the sum of its proper divisors (6131).

891169 is a wasteful number, since it uses less digits than its factorization.

891169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6130.

The product of its digits is 3888, while the sum is 34.

The square root of 891169 is about 944.0174786517. The cubic root of 891169 is about 96.2321133907.

The spelling of 891169 in words is "eight hundred ninety-one thousand, one hundred sixty-nine".