218005243 has 2 divisors, whose sum is σ = 218005244. Its totient is φ = 218005242.

The previous prime is 218005219. The next prime is 218005261. The reversal of 218005243 is 342500812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218005243 - 2⁵ = 218005211 is a prime.

It is not a weakly prime, because it can be changed into another prime (218005213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109002621 + 109002622.

It is an arithmetic number, because the mean of its divisors is an integer number (109002622).

Almost surely, 2^218005243 is an apocalyptic number.

218005243 is a deficient number, since it is larger than the sum of its proper divisors (1).

218005243 is an equidigital number, since it uses as much as digits as its factorization.

218005243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 218005243 is about 14765.0006095496. Note that the first 3 decimals coincide. The cubic root of 218005243 is about 601.8509903341.

The spelling of 218005243 in words is "two hundred eighteen million, five thousand, two hundred forty-three".