218284961 has 2 divisors, whose sum is σ = 218284962. Its totient is φ = 218284960.

The previous prime is 218284949. The next prime is 218284987. The reversal of 218284961 is 169482812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182763361 + 35521600 = 13519^2 + 5960^2 .

It is a cyclic number.

It is not a de Polignac number, because 218284961 - 2⁶ = 218284897 is a prime.

It is not a weakly prime, because it can be changed into another prime (218284921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109142480 + 109142481.

It is an arithmetic number, because the mean of its divisors is an integer number (109142481).

Almost surely, 2^218284961 is an apocalyptic number.

It is an amenable number.

218284961 is a deficient number, since it is larger than the sum of its proper divisors (1).

218284961 is an equidigital number, since it uses as much as digits as its factorization.

218284961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 218284961 is about 14774.4699058883. The cubic root of 218284961 is about 602.1082878235.

The spelling of 218284961 in words is "two hundred eighteen million, two hundred eighty-four thousand, nine hundred sixty-one".