218518849 has 2 divisors, whose sum is σ = 218518850. Its totient is φ = 218518848.

The previous prime is 218518847. The next prime is 218518877. The reversal of 218518849 is 948815812.

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., 184960000 + 33558849 = 13600^2 + 5793^2 .

It is a cyclic number.

It is not a de Polignac number, because 218518849 - 2¹ = 218518847 is a prime.

Together with 218518847, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 218518799 and 218518808.

It is not a weakly prime, because it can be changed into another prime (218518847) 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, 109259424 + 109259425.

It is an arithmetic number, because the mean of its divisors is an integer number (109259425).

Almost surely, 2^218518849 is an apocalyptic number.

It is an amenable number.

218518849 is a deficient number, since it is larger than the sum of its proper divisors (1).

218518849 is an equidigital number, since it uses as much as digits as its factorization.

218518849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 184320, while the sum is 46.

The square root of 218518849 is about 14782.3830622806. The cubic root of 218518849 is about 602.3232600859.

The spelling of 218518849 in words is "two hundred eighteen million, five hundred eighteen thousand, eight hundred forty-nine".