218936161 has 2 divisors, whose sum is σ = 218936162. Its totient is φ = 218936160.

The previous prime is 218936119. The next prime is 218936213. The reversal of 218936161 is 161639812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170145936 + 48790225 = 13044^2 + 6985^2 .

It is a cyclic number.

It is not a de Polignac number, because 218936161 - 2¹⁷ = 218805089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218936161.

It is not a weakly prime, because it can be changed into another prime (218936111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109468080 + 109468081.

It is an arithmetic number, because the mean of its divisors is an integer number (109468081).

Almost surely, 2^218936161 is an apocalyptic number.

It is an amenable number.

218936161 is a deficient number, since it is larger than the sum of its proper divisors (1).

218936161 is an equidigital number, since it uses as much as digits as its factorization.

218936161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 218936161 is about 14796.4915098141. The cubic root of 218936161 is about 602.7064411969.

The spelling of 218936161 in words is "two hundred eighteen million, nine hundred thirty-six thousand, one hundred sixty-one".