91223 has 4 divisors (see below), whose sum is σ = 99528. Its totient is φ = 82920.

The previous prime is 91199. The next prime is 91229. The reversal of 91223 is 32219.

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

It is a cyclic number.

It is not a de Polignac number, because 91223 - 2⁶ = 91159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91229) 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, 4136 + ... + 4157.

It is an arithmetic number, because the mean of its divisors is an integer number (24882).

2⁹¹²²³ is an apocalyptic number.

91223 is a deficient number, since it is larger than the sum of its proper divisors (8305).

91223 is a wasteful number, since it uses less digits than its factorization.

91223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8304.

The product of its digits is 108, while the sum is 17.

The square root of 91223 is about 302.0314553155. The cubic root of 91223 is about 45.0161259078.

The spelling of 91223 in words is "ninety-one thousand, two hundred twenty-three".