218281116 has 12 divisors (see below), whose sum is σ = 509322632. Its totient is φ = 72760368.

The previous prime is 218281073. The next prime is 218281117. The reversal of 218281116 is 611182812.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218281117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9095035 + ... + 9095058.

Almost surely, 2^218281116 is an apocalyptic number.

It is an amenable number.

218281116 is an abundant number, since it is smaller than the sum of its proper divisors (291041516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218281116 is a wasteful number, since it uses less digits than its factorization.

218281116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18190100 (or 18190098 counting only the distinct ones).

The product of its digits is 1536, while the sum is 30.

The square root of 218281116 is about 14774.3397822035. The cubic root of 218281116 is about 602.1047525059.

The spelling of 218281116 in words is "two hundred eighteen million, two hundred eighty-one thousand, one hundred sixteen".