218818073 has 2 divisors, whose sum is σ = 218818074. Its totient is φ = 218818072.

The previous prime is 218818043. The next prime is 218818091. The reversal of 218818073 is 370818812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184090624 + 34727449 = 13568^2 + 5893^2 .

It is a cyclic number.

It is not a de Polignac number, because 218818073 - 2⁶ = 218818009 is a prime.

It is not a weakly prime, because it can be changed into another prime (218818043) 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, 109409036 + 109409037.

It is an arithmetic number, because the mean of its divisors is an integer number (109409037).

Almost surely, 2^218818073 is an apocalyptic number.

It is an amenable number.

218818073 is a deficient number, since it is larger than the sum of its proper divisors (1).

218818073 is an equidigital number, since it uses as much as digits as its factorization.

218818073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 218818073 is about 14792.5005661653. The cubic root of 218818073 is about 602.5980607481.

The spelling of 218818073 in words is "two hundred eighteen million, eight hundred eighteen thousand, seventy-three".