891193 has 4 divisors (see below), whose sum is σ = 898128. Its totient is φ = 884260.

The previous prime is 891179. The next prime is 891223. The reversal of 891193 is 391198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 391198 = 2 ⋅195599.

It is a cyclic number.

It is not a de Polignac number, because 891193 - 2⁵ = 891161 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, 3271 + ... + 3532.

It is an arithmetic number, because the mean of its divisors is an integer number (224532).

2⁸⁹¹¹⁹³ is an apocalyptic number.

It is an amenable number.

891193 is a deficient number, since it is larger than the sum of its proper divisors (6935).

891193 is a wasteful number, since it uses less digits than its factorization.

891193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934.

The product of its digits is 1944, while the sum is 31.

The square root of 891193 is about 944.0301901952. The cubic root of 891193 is about 96.2329772560.

Subtracting from 891193 its product of digits (1944), we obtain a square (889249 = 943²).

The spelling of 891193 in words is "eight hundred ninety-one thousand, one hundred ninety-three".