218284987 has 2 divisors, whose sum is σ = 218284988. Its totient is φ = 218284986.

The previous prime is 218284961. The next prime is 218284993. The reversal of 218284987 is 789482812.

218284987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218284987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218284987.

It is not a weakly prime, because it can be changed into another prime (218287987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109142493 + 109142494.

It is an arithmetic number, because the mean of its divisors is an integer number (109142494).

Almost surely, 2^218284987 is an apocalyptic number.

218284987 is a deficient number, since it is larger than the sum of its proper divisors (1).

218284987 is an equidigital number, since it uses as much as digits as its factorization.

218284987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 49.

The square root of 218284987 is about 14774.4707857845. The cubic root of 218284987 is about 602.1083117292.

The spelling of 218284987 in words is "two hundred eighteen million, two hundred eighty-four thousand, nine hundred eighty-seven".