91911010993 has 2 divisors, whose sum is σ = 91911010994. Its totient is φ = 91911010992.

The previous prime is 91911010991. The next prime is 91911011063. The reversal of 91911010993 is 39901011919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75744397089 + 16166613904 = 275217^2 + 127148^2 .

It is a cyclic number.

It is not a de Polignac number, because 91911010993 - 2¹ = 91911010991 is a prime.

Together with 91911010991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91911010991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45955505496 + 45955505497.

It is an arithmetic number, because the mean of its divisors is an integer number (45955505497).

Almost surely, 2^91911010993 is an apocalyptic number.

It is an amenable number.

91911010993 is a deficient number, since it is larger than the sum of its proper divisors (1).

91911010993 is an equidigital number, since it uses as much as digits as its factorization.

91911010993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19683, while the sum is 43.

The spelling of 91911010993 in words is "ninety-one billion, nine hundred eleven million, ten thousand, nine hundred ninety-three".