91011223 has 8 divisors (see below), whose sum is σ = 93623040. Its totient is φ = 88427640.

The previous prime is 91011211. The next prime is 91011227. The reversal of 91011223 is 32211019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91011223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91011223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91011227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433 + ... + 13498.

It is an arithmetic number, because the mean of its divisors is an integer number (11702880).

Almost surely, 2^91011223 is an apocalyptic number.

91011223 is a deficient number, since it is larger than the sum of its proper divisors (2611817).

91011223 is a wasteful number, since it uses less digits than its factorization.

91011223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14117.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 91011223 is about 9539.9802410697. The cubic root of 91011223 is about 449.8126347553.

The spelling of 91011223 in words is "ninety-one million, eleven thousand, two hundred twenty-three".