218020133 has 2 divisors, whose sum is σ = 218020134. Its totient is φ = 218020132.

The previous prime is 218020123. The next prime is 218020139. The reversal of 218020133 is 331020812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171138724 + 46881409 = 13082^2 + 6847^2 .

It is a cyclic number.

It is not a de Polignac number, because 218020133 - 2⁸ = 218019877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218020139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109010066 + 109010067.

It is an arithmetic number, because the mean of its divisors is an integer number (109010067).

Almost surely, 2^218020133 is an apocalyptic number.

It is an amenable number.

218020133 is a deficient number, since it is larger than the sum of its proper divisors (1).

218020133 is an equidigital number, since it uses as much as digits as its factorization.

218020133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 218020133 is about 14765.5048339026. The cubic root of 218020133 is about 601.8646923856.

Adding to 218020133 its reverse (331020812), we get a palindrome (549040945).

The spelling of 218020133 in words is "two hundred eighteen million, twenty thousand, one hundred thirty-three".