91863719999 has 2 divisors, whose sum is σ = 91863720000. Its totient is φ = 91863719998.

The previous prime is 91863719971. The next prime is 91863720023. The reversal of 91863719999 is 99991736819.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91863719999 - 2¹² = 91863715903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91863719939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45931859999 + 45931860000.

It is an arithmetic number, because the mean of its divisors is an integer number (45931860000).

Almost surely, 2^91863719999 is an apocalyptic number.

91863719999 is a deficient number, since it is larger than the sum of its proper divisors (1).

91863719999 is an equidigital number, since it uses as much as digits as its factorization.

91863719999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59521392, while the sum is 71.

The spelling of 91863719999 in words is "ninety-one billion, eight hundred sixty-three million, seven hundred nineteen thousand, nine hundred ninety-nine".