91336820671 has 2 divisors, whose sum is σ = 91336820672. Its totient is φ = 91336820670.

The previous prime is 91336820609. The next prime is 91336820761. The reversal of 91336820671 is 17602863319.

Together with next prime (91336820761) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91336820671 - 2¹⁵ = 91336787903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91336821671) 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, 45668410335 + 45668410336.

It is an arithmetic number, because the mean of its divisors is an integer number (45668410336).

Almost surely, 2^91336820671 is an apocalyptic number.

91336820671 is a deficient number, since it is larger than the sum of its proper divisors (1).

91336820671 is an equidigital number, since it uses as much as digits as its factorization.

91336820671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 91336820671 in words is "ninety-one billion, three hundred thirty-six million, eight hundred twenty thousand, six hundred seventy-one".