91404449827 has 2 divisors, whose sum is σ = 91404449828. Its totient is φ = 91404449826.

The previous prime is 91404449819. The next prime is 91404449867. The reversal of 91404449827 is 72894440419.

It is a weak prime.

It is an emirp because it is prime and its reverse (72894440419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91404449827 - 2³ = 91404449819 is a prime.

It is not a weakly prime, because it can be changed into another prime (91404449867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45702224913 + 45702224914.

It is an arithmetic number, because the mean of its divisors is an integer number (45702224914).

Almost surely, 2^91404449827 is an apocalyptic number.

91404449827 is a deficient number, since it is larger than the sum of its proper divisors (1).

91404449827 is an equidigital number, since it uses as much as digits as its factorization.

91404449827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 91404449827 in words is "ninety-one billion, four hundred four million, four hundred forty-nine thousand, eight hundred twenty-seven".