18145073 has 2 divisors, whose sum is σ = 18145074. Its totient is φ = 18145072.

The previous prime is 18145067. The next prime is 18145087. The reversal of 18145073 is 37054181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 446224 = 4207^2 + 668^2 .

It is an emirp because it is prime and its reverse (37054181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18145073 - 2⁶ = 18145009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18145003) 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, 9072536 + 9072537.

It is an arithmetic number, because the mean of its divisors is an integer number (9072537).

Almost surely, 2^18145073 is an apocalyptic number.

It is an amenable number.

18145073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18145073 is an equidigital number, since it uses as much as digits as its factorization.

18145073 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 18145073 is about 4259.7033934301. The cubic root of 18145073 is about 262.7763282118.

It can be divided in two parts, 181 and 45073, that added together give a palindrome (45254).

The spelling of 18145073 in words is "eighteen million, one hundred forty-five thousand, seventy-three".