91055378177 has 2 divisors, whose sum is σ = 91055378178. Its totient is φ = 91055378176.

The previous prime is 91055378171. The next prime is 91055378221. The reversal of 91055378177 is 77187355019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90610632256 + 444745921 = 301016^2 + 21089^2 .

It is an emirp because it is prime and its reverse (77187355019) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91055378177 is a prime.

It is not a weakly prime, because it can be changed into another prime (91055378171) 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, 45527689088 + 45527689089.

It is an arithmetic number, because the mean of its divisors is an integer number (45527689089).

Almost surely, 2^91055378177 is an apocalyptic number.

It is an amenable number.

91055378177 is a deficient number, since it is larger than the sum of its proper divisors (1).

91055378177 is an equidigital number, since it uses as much as digits as its factorization.

91055378177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1852200, while the sum is 53.

The spelling of 91055378177 in words is "ninety-one billion, fifty-five million, three hundred seventy-eight thousand, one hundred seventy-seven".