218572241 has 2 divisors, whose sum is σ = 218572242. Its totient is φ = 218572240.

The previous prime is 218572183. The next prime is 218572259. The reversal of 218572241 is 142275812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114939841 + 103632400 = 10721^2 + 10180^2 .

It is a cyclic number.

It is not a de Polignac number, because 218572241 - 2²² = 214377937 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 218572198 and 218572207.

It is not a weakly prime, because it can be changed into another prime (218572261) 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, 109286120 + 109286121.

It is an arithmetic number, because the mean of its divisors is an integer number (109286121).

Almost surely, 2^218572241 is an apocalyptic number.

It is an amenable number.

218572241 is a deficient number, since it is larger than the sum of its proper divisors (1).

218572241 is an equidigital number, since it uses as much as digits as its factorization.

218572241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 218572241 is about 14784.1888854276. The cubic root of 218572241 is about 602.3723124900.

The spelling of 218572241 in words is "two hundred eighteen million, five hundred seventy-two thousand, two hundred forty-one".