91065582109 has 2 divisors, whose sum is σ = 91065582110. Its totient is φ = 91065582108.

The previous prime is 91065582089. The next prime is 91065582161. The reversal of 91065582109 is 90128556019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91004788900 + 60793209 = 301670^2 + 7797^2 .

It is a cyclic number.

It is not a de Polignac number, because 91065582109 - 2⁵ = 91065582077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91065585109) 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, 45532791054 + 45532791055.

It is an arithmetic number, because the mean of its divisors is an integer number (45532791055).

Almost surely, 2^91065582109 is an apocalyptic number.

It is an amenable number.

91065582109 is a deficient number, since it is larger than the sum of its proper divisors (1).

91065582109 is an equidigital number, since it uses as much as digits as its factorization.

91065582109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 91065582109 in words is "ninety-one billion, sixty-five million, five hundred eighty-two thousand, one hundred nine".