91939324823 has 2 divisors, whose sum is σ = 91939324824. Its totient is φ = 91939324822.

The previous prime is 91939324753. The next prime is 91939324831. The reversal of 91939324823 is 32842393919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91939324823 - 2²⁰ = 91938276247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91939324853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45969662411 + 45969662412.

It is an arithmetic number, because the mean of its divisors is an integer number (45969662412).

Almost surely, 2^91939324823 is an apocalyptic number.

91939324823 is a deficient number, since it is larger than the sum of its proper divisors (1).

91939324823 is an equidigital number, since it uses as much as digits as its factorization.

91939324823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 53.

The spelling of 91939324823 in words is "ninety-one billion, nine hundred thirty-nine million, three hundred twenty-four thousand, eight hundred twenty-three".