91449388861 has 2 divisors, whose sum is σ = 91449388862. Its totient is φ = 91449388860.

The previous prime is 91449388783. The next prime is 91449388867. The reversal of 91449388861 is 16888394419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91449388836 + 25 = 302406^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 91449388861 - 2²³ = 91441000253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91449388861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91449388867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45724694430 + 45724694431.

It is an arithmetic number, because the mean of its divisors is an integer number (45724694431).

Almost surely, 2^91449388861 is an apocalyptic number.

It is an amenable number.

91449388861 is a deficient number, since it is larger than the sum of its proper divisors (1).

91449388861 is an equidigital number, since it uses as much as digits as its factorization.

91449388861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11943936, while the sum is 61.

The spelling of 91449388861 in words is "ninety-one billion, four hundred forty-nine million, three hundred eighty-eight thousand, eight hundred sixty-one".