218026849 has 2 divisors, whose sum is σ = 218026850. Its totient is φ = 218026848.

The previous prime is 218026847. The next prime is 218026891. The reversal of 218026849 is 948620812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194407249 + 23619600 = 13943^2 + 4860^2 .

It is a cyclic number.

It is not a de Polignac number, because 218026849 - 2¹ = 218026847 is a prime.

Together with 218026847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (218026847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109013424 + 109013425.

It is an arithmetic number, because the mean of its divisors is an integer number (109013425).

Almost surely, 2^218026849 is an apocalyptic number.

It is an amenable number.

218026849 is a deficient number, since it is larger than the sum of its proper divisors (1).

218026849 is an equidigital number, since it uses as much as digits as its factorization.

218026849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 218026849 is about 14765.7322541078. The cubic root of 218026849 is about 601.8708723680.

The spelling of 218026849 in words is "two hundred eighteen million, twenty-six thousand, eight hundred forty-nine".