91123223 has 4 divisors (see below), whose sum is σ = 91181880. Its totient is φ = 91064568.

The previous prime is 91123211. The next prime is 91123231. The reversal of 91123223 is 32232119.

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 91123223 - 2²⁶ = 24014359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91123243) 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, 26933 + ... + 30126.

It is an arithmetic number, because the mean of its divisors is an integer number (22795470).

Almost surely, 2^91123223 is an apocalyptic number.

91123223 is a deficient number, since it is larger than the sum of its proper divisors (58657).

91123223 is a wasteful number, since it uses less digits than its factorization.

91123223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58656.

The product of its digits is 648, while the sum is 23.

The square root of 91123223 is about 9545.8484693609. The cubic root of 91123223 is about 449.9970748781.

The spelling of 91123223 in words is "ninety-one million, one hundred twenty-three thousand, two hundred twenty-three".