18045173 has 2 divisors, whose sum is σ = 18045174. Its totient is φ = 18045172.

The previous prime is 18045067. The next prime is 18045197. The reversal of 18045173 is 37154081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 1868689 = 4022^2 + 1367^2 .

It is a cyclic number.

It is not a de Polignac number, because 18045173 - 2¹² = 18041077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18045473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9022586 + 9022587.

It is an arithmetic number, because the mean of its divisors is an integer number (9022587).

Almost surely, 2^18045173 is an apocalyptic number.

It is an amenable number.

18045173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18045173 is an equidigital number, since it uses as much as digits as its factorization.

18045173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 18045173 is about 4247.9610403110. The cubic root of 18045173 is about 262.2931910023.

The spelling of 18045173 in words is "eighteen million, forty-five thousand, one hundred seventy-three".