91010173 has 2 divisors, whose sum is σ = 91010174. Its totient is φ = 91010172.

The previous prime is 91010147. The next prime is 91010219. The reversal of 91010173 is 37101019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74183769 + 16826404 = 8613^2 + 4102^2 .

It is an emirp because it is prime and its reverse (37101019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91010173 - 2⁹ = 91009661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91010113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45505086 + 45505087.

It is an arithmetic number, because the mean of its divisors is an integer number (45505087).

Almost surely, 2^91010173 is an apocalyptic number.

It is an amenable number.

91010173 is a deficient number, since it is larger than the sum of its proper divisors (1).

91010173 is an equidigital number, since it uses as much as digits as its factorization.

91010173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189, while the sum is 22.

The square root of 91010173 is about 9539.9252093504. The cubic root of 91010173 is about 449.8109049134.

The spelling of 91010173 in words is "ninety-one million, ten thousand, one hundred seventy-three".