91989223 has 2 divisors, whose sum is σ = 91989224. Its totient is φ = 91989222.

The previous prime is 91989221. The next prime is 91989251. The reversal of 91989223 is 32298919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91989223 - 2¹ = 91989221 is a prime.

Together with 91989221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91989223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91989221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45994611 + 45994612.

It is an arithmetic number, because the mean of its divisors is an integer number (45994612).

Almost surely, 2^91989223 is an apocalyptic number.

91989223 is a deficient number, since it is larger than the sum of its proper divisors (1).

91989223 is an equidigital number, since it uses as much as digits as its factorization.

91989223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 91989223 is about 9591.1012402122. The cubic root of 91989223 is about 451.4181156018.

The spelling of 91989223 in words is "ninety-one million, nine hundred eighty-nine thousand, two hundred twenty-three".