218805859 has 2 divisors, whose sum is σ = 218805860. Its totient is φ = 218805858.

The previous prime is 218805857. The next prime is 218805869. The reversal of 218805859 is 958508812.

218805859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218805859 - 2¹ = 218805857 is a prime.

Together with 218805857, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (218805857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109402929 + 109402930.

It is an arithmetic number, because the mean of its divisors is an integer number (109402930).

Almost surely, 2^218805859 is an apocalyptic number.

218805859 is a deficient number, since it is larger than the sum of its proper divisors (1).

218805859 is an equidigital number, since it uses as much as digits as its factorization.

218805859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 46.

The square root of 218805859 is about 14792.0877160731. The cubic root of 218805859 is about 602.5868485882.

The spelling of 218805859 in words is "two hundred eighteen million, eight hundred five thousand, eight hundred fifty-nine".