218740073 has 2 divisors, whose sum is σ = 218740074. Its totient is φ = 218740072.

The previous prime is 218740057. The next prime is 218740087. The reversal of 218740073 is 370047812.

It is a happy number.

218740073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217031824 + 1708249 = 14732^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 218740073 - 2⁴ = 218740057 is a prime.

It is not a weakly prime, because it can be changed into another prime (218740013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109370036 + 109370037.

It is an arithmetic number, because the mean of its divisors is an integer number (109370037).

Almost surely, 2^218740073 is an apocalyptic number.

It is an amenable number.

218740073 is a deficient number, since it is larger than the sum of its proper divisors (1).

218740073 is an equidigital number, since it uses as much as digits as its factorization.

218740073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 218740073 is about 14789.8638600901. The cubic root of 218740073 is about 602.5264514365.

Adding to 218740073 its reverse (370047812), we get a palindrome (588787885).

The spelling of 218740073 in words is "two hundred eighteen million, seven hundred forty thousand, seventy-three".