218850857 has 2 divisors, whose sum is σ = 218850858. Its totient is φ = 218850856.

The previous prime is 218850839. The next prime is 218850869. The reversal of 218850857 is 758058812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146192281 + 72658576 = 12091^2 + 8524^2 .

It is a cyclic number.

It is not a de Polignac number, because 218850857 - 2⁸ = 218850601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218850817) 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, 109425428 + 109425429.

It is an arithmetic number, because the mean of its divisors is an integer number (109425429).

Almost surely, 2^218850857 is an apocalyptic number.

It is an amenable number.

218850857 is a deficient number, since it is larger than the sum of its proper divisors (1).

218850857 is an equidigital number, since it uses as much as digits as its factorization.

218850857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 179200, while the sum is 44.

The square root of 218850857 is about 14793.6086537396. The cubic root of 218850857 is about 602.6281536132.

The spelling of 218850857 in words is "two hundred eighteen million, eight hundred fifty thousand, eight hundred fifty-seven".