91549041173 has 2 divisors, whose sum is σ = 91549041174. Its totient is φ = 91549041172.

The previous prime is 91549041151. The next prime is 91549041179. The reversal of 91549041173 is 37114094519.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85213199569 + 6335841604 = 291913^2 + 79598^2 .

It is a cyclic number.

It is not a de Polignac number, because 91549041173 - 2⁶ = 91549041109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91549041179) 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, 45774520586 + 45774520587.

It is an arithmetic number, because the mean of its divisors is an integer number (45774520587).

Almost surely, 2^91549041173 is an apocalyptic number.

It is an amenable number.

91549041173 is a deficient number, since it is larger than the sum of its proper divisors (1).

91549041173 is an equidigital number, since it uses as much as digits as its factorization.

91549041173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 91549041173 in words is "ninety-one billion, five hundred forty-nine million, forty-one thousand, one hundred seventy-three".