218161312 has 24 divisors (see below), whose sum is σ = 431676000. Its totient is φ = 108529344.

The previous prime is 218161297. The next prime is 218161343. The reversal of 218161312 is 213161812.

It is a super-2 number, since 2×218161312² = 95188716107122688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10762 + ... + 23497.

It is an arithmetic number, because the mean of its divisors is an integer number (17986500).

Almost surely, 2^218161312 is an apocalyptic number.

It is an amenable number.

218161312 is a deficient number, since it is larger than the sum of its proper divisors (213514688).

218161312 is a wasteful number, since it uses less digits than its factorization.

218161312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34468 (or 34460 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 218161312 is about 14770.2847636733. The cubic root of 218161312 is about 601.9945769058.

The spelling of 218161312 in words is "two hundred eighteen million, one hundred sixty-one thousand, three hundred twelve".