91373648173 has 2 divisors, whose sum is σ = 91373648174. Its totient is φ = 91373648172.

The previous prime is 91373648089. The next prime is 91373648213. The reversal of 91373648173 is 37184637319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89618205769 + 1755442404 = 299363^2 + 41898^2 .

It is a cyclic number.

It is not a de Polignac number, because 91373648173 - 2³³ = 82783713581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91373648173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91376648173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45686824086 + 45686824087.

It is an arithmetic number, because the mean of its divisors is an integer number (45686824087).

Almost surely, 2^91373648173 is an apocalyptic number.

It is an amenable number.

91373648173 is a deficient number, since it is larger than the sum of its proper divisors (1).

91373648173 is an equidigital number, since it uses as much as digits as its factorization.

91373648173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 52.

The spelling of 91373648173 in words is "ninety-one billion, three hundred seventy-three million, six hundred forty-eight thousand, one hundred seventy-three".