91055772133 has 2 divisors, whose sum is σ = 91055772134. Its totient is φ = 91055772132.

The previous prime is 91055772043. The next prime is 91055772149. The reversal of 91055772133 is 33127755019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63785543364 + 27270228769 = 252558^2 + 165137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91055772133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91055772133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91055772733) 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, 45527886066 + 45527886067.

It is an arithmetic number, because the mean of its divisors is an integer number (45527886067).

Almost surely, 2^91055772133 is an apocalyptic number.

It is an amenable number.

91055772133 is a deficient number, since it is larger than the sum of its proper divisors (1).

91055772133 is an equidigital number, since it uses as much as digits as its factorization.

91055772133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 198450, while the sum is 43.

The spelling of 91055772133 in words is "ninety-one billion, fifty-five million, seven hundred seventy-two thousand, one hundred thirty-three".