91488705793 has 2 divisors, whose sum is σ = 91488705794. Its totient is φ = 91488705792.

The previous prime is 91488705739. The next prime is 91488705857. The reversal of 91488705793 is 39750788419.

Together with previous prime (91488705739) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78077212929 + 13411492864 = 279423^2 + 115808^2 .

It is an emirp because it is prime and its reverse (39750788419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91488705793 - 2²¹ = 91486608641 is a prime.

It is a super-2 number, since 2×91488705793² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91488505793) 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, 45744352896 + 45744352897.

It is an arithmetic number, because the mean of its divisors is an integer number (45744352897).

Almost surely, 2^91488705793 is an apocalyptic number.

It is an amenable number.

91488705793 is a deficient number, since it is larger than the sum of its proper divisors (1).

91488705793 is an equidigital number, since it uses as much as digits as its factorization.

91488705793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 91488705793 in words is "ninety-one billion, four hundred eighty-eight million, seven hundred five thousand, seven hundred ninety-three".