218697316 has 12 divisors (see below), whose sum is σ = 405233388. Its totient is φ = 102916352.

The previous prime is 218697307. The next prime is 218697329. The reversal of 218697316 is 613796812.

It can be written as a sum of positive squares in 2 ways, for example, as 99800100 + 118897216 = 9990^2 + 10904^2 .

It is an unprimeable number.

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, 1608001 + ... + 1608136.

It is an arithmetic number, because the mean of its divisors is an integer number (33769449).

Almost surely, 2^218697316 is an apocalyptic number.

It is an amenable number.

218697316 is a deficient number, since it is larger than the sum of its proper divisors (186536072).

218697316 is a wasteful number, since it uses less digits than its factorization.

218697316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216158 (or 3216156 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 218697316 is about 14788.4183062287. The cubic root of 218697316 is about 602.4871903752.

The spelling of 218697316 in words is "two hundred eighteen million, six hundred ninety-seven thousand, three hundred sixteen".