218730073 has 2 divisors, whose sum is σ = 218730074. Its totient is φ = 218730072.

The previous prime is 218730059. The next prime is 218730077. The reversal of 218730073 is 370037812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193849929 + 24880144 = 13923^2 + 4988^2 .

It is a cyclic number.

It is not a de Polignac number, because 218730073 - 2⁹ = 218729561 is a prime.

It is not a weakly prime, because it can be changed into another prime (218730077) 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, 109365036 + 109365037.

It is an arithmetic number, because the mean of its divisors is an integer number (109365037).

Almost surely, 2^218730073 is an apocalyptic number.

It is an amenable number.

218730073 is a deficient number, since it is larger than the sum of its proper divisors (1).

218730073 is an equidigital number, since it uses as much as digits as its factorization.

218730073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 218730073 is about 14789.5257868533. The cubic root of 218730073 is about 602.5172695245.

Adding to 218730073 its reverse (370037812), we get a palindrome (588767885).

The spelling of 218730073 in words is "two hundred eighteen million, seven hundred thirty thousand, seventy-three".