218998841 has 2 divisors, whose sum is σ = 218998842. Its totient is φ = 218998840.

The previous prime is 218998817. The next prime is 218998853. The reversal of 218998841 is 148899812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212547241 + 6451600 = 14579^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 218998841 - 2¹⁸ = 218736697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 218998841.

It is not a weakly prime, because it can be changed into another prime (218998891) 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, 109499420 + 109499421.

It is an arithmetic number, because the mean of its divisors is an integer number (109499421).

Almost surely, 2^218998841 is an apocalyptic number.

It is an amenable number.

218998841 is a deficient number, since it is larger than the sum of its proper divisors (1).

218998841 is an equidigital number, since it uses as much as digits as its factorization.

218998841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 50.

The square root of 218998841 is about 14798.6094279159. The cubic root of 218998841 is about 602.7639526879.

The spelling of 218998841 in words is "two hundred eighteen million, nine hundred ninety-eight thousand, eight hundred forty-one".