91693891811 has 2 divisors, whose sum is σ = 91693891812. Its totient is φ = 91693891810.

The previous prime is 91693891799. The next prime is 91693891847. The reversal of 91693891811 is 11819839619.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91693891811 is a prime.

It is not a weakly prime, because it can be changed into another prime (91693891511) 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, 45846945905 + 45846945906.

It is an arithmetic number, because the mean of its divisors is an integer number (45846945906).

Almost surely, 2^91693891811 is an apocalyptic number.

91693891811 is a deficient number, since it is larger than the sum of its proper divisors (1).

91693891811 is an equidigital number, since it uses as much as digits as its factorization.

91693891811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 56.

The spelling of 91693891811 in words is "ninety-one billion, six hundred ninety-three million, eight hundred ninety-one thousand, eight hundred eleven".