891223 has 2 divisors, whose sum is σ = 891224. Its totient is φ = 891222.

The previous prime is 891179. The next prime is 891239. The reversal of 891223 is 322198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891223 - 2⁹ = 890711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445611 + 445612.

It is an arithmetic number, because the mean of its divisors is an integer number (445612).

2⁸⁹¹²²³ is an apocalyptic number.

891223 is a deficient number, since it is larger than the sum of its proper divisors (1).

891223 is an equidigital number, since it uses as much as digits as its factorization.

891223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 891223 is about 944.0460793838. The cubic root of 891223 is about 96.2340570659.

Subtracting from 891223 its sum of digits (25), we obtain a palindrome (891198).

The spelling of 891223 in words is "eight hundred ninety-one thousand, two hundred twenty-three".