218116841 has 2 divisors, whose sum is σ = 218116842. Its totient is φ = 218116840.

The previous prime is 218116831. The next prime is 218116883. The reversal of 218116841 is 148611812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212547241 + 5569600 = 14579^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 218116841 - 2¹⁴ = 218100457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 218116798 and 218116807.

It is not a weakly prime, because it can be changed into another prime (218116831) 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, 109058420 + 109058421.

It is an arithmetic number, because the mean of its divisors is an integer number (109058421).

Almost surely, 2^218116841 is an apocalyptic number.

It is an amenable number.

218116841 is a deficient number, since it is larger than the sum of its proper divisors (1).

218116841 is an equidigital number, since it uses as much as digits as its factorization.

218116841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 32.

The square root of 218116841 is about 14768.7792657349. The cubic root of 218116841 is about 601.9536696831.

The spelling of 218116841 in words is "two hundred eighteen million, one hundred sixteen thousand, eight hundred forty-one".