218961224 has 16 divisors (see below), whose sum is σ = 434702700. Its totient is φ = 103040512.

The previous prime is 218961217. The next prime is 218961229. The reversal of 218961224 is 422169812.

It can be written as a sum of positive squares in 2 ways, for example, as 188512900 + 30448324 = 13730^2 + 5518^2 .

It is not an unprimeable number, because it can be changed into a prime (218961229) 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 in 3 ways as a sum of consecutive naturals, for example, 804869 + ... + 805140.

Almost surely, 2^218961224 is an apocalyptic number.

It is an amenable number.

218961224 is a deficient number, since it is larger than the sum of its proper divisors (215741476).

218961224 is a wasteful number, since it uses less digits than its factorization.

218961224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610032 (or 1610028 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 218961224 is about 14797.3384093221. The cubic root of 218961224 is about 602.7294388523.

The spelling of 218961224 in words is "two hundred eighteen million, nine hundred sixty-one thousand, two hundred twenty-four".