218994143 has 2 divisors, whose sum is σ = 218994144. Its totient is φ = 218994142.

The previous prime is 218994107. The next prime is 218994151. The reversal of 218994143 is 341499812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218994143 - 2¹⁰ = 218993119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218994143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218994043) 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, 109497071 + 109497072.

It is an arithmetic number, because the mean of its divisors is an integer number (109497072).

Almost surely, 2^218994143 is an apocalyptic number.

218994143 is a deficient number, since it is larger than the sum of its proper divisors (1).

218994143 is an equidigital number, since it uses as much as digits as its factorization.

218994143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 218994143 is about 14798.4506959344. The cubic root of 218994143 is about 602.7596424592.

The spelling of 218994143 in words is "two hundred eighteen million, nine hundred ninety-four thousand, one hundred forty-three".