218056243 has 2 divisors, whose sum is σ = 218056244. Its totient is φ = 218056242.

The previous prime is 218056211. The next prime is 218056283. The reversal of 218056243 is 342650812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218056243 - 2⁵ = 218056211 is a prime.

It is a super-2 number, since 2×218056243² = 95097050222550098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218056283) 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, 109028121 + 109028122.

It is an arithmetic number, because the mean of its divisors is an integer number (109028122).

Almost surely, 2^218056243 is an apocalyptic number.

218056243 is a deficient number, since it is larger than the sum of its proper divisors (1).

218056243 is an equidigital number, since it uses as much as digits as its factorization.

218056243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 218056243 is about 14766.7275657134. The cubic root of 218056243 is about 601.8979188802.

The spelling of 218056243 in words is "two hundred eighteen million, fifty-six thousand, two hundred forty-three".