218244281 has 2 divisors, whose sum is σ = 218244282. Its totient is φ = 218244280.

The previous prime is 218244211. The next prime is 218244289. The reversal of 218244281 is 182442812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152893225 + 65351056 = 12365^2 + 8084^2 .

It is a cyclic number.

It is not a de Polignac number, because 218244281 - 2¹⁴ = 218227897 is a prime.

It is a super-2 number, since 2×218244281² = 95261132378413922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218244289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109122140 + 109122141.

It is an arithmetic number, because the mean of its divisors is an integer number (109122141).

Almost surely, 2^218244281 is an apocalyptic number.

It is an amenable number.

218244281 is a deficient number, since it is larger than the sum of its proper divisors (1).

218244281 is an equidigital number, since it uses as much as digits as its factorization.

218244281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8192, while the sum is 32.

The square root of 218244281 is about 14773.0931426022. The cubic root of 218244281 is about 602.0708821516.

The spelling of 218244281 in words is "two hundred eighteen million, two hundred forty-four thousand, two hundred eighty-one".