99090090173 has 2 divisors, whose sum is σ = 99090090174. Its totient is φ = 99090090172.

The previous prime is 99090090133. The next prime is 99090090221. The reversal of 99090090173 is 37109009099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99012174244 + 77915929 = 314662^2 + 8827^2 .

It is a cyclic number.

It is not a de Polignac number, because 99090090173 - 2⁶ = 99090090109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99090090133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49545045086 + 49545045087.

It is an arithmetic number, because the mean of its divisors is an integer number (49545045087).

Almost surely, 2^99090090173 is an apocalyptic number.

It is an amenable number.

99090090173 is a deficient number, since it is larger than the sum of its proper divisors (1).

99090090173 is an equidigital number, since it uses as much as digits as its factorization.

99090090173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137781, while the sum is 47.

The spelling of 99090090173 in words is "ninety-nine billion, ninety million, ninety thousand, one hundred seventy-three".