218361994 has 4 divisors (see below), whose sum is σ = 327542994. Its totient is φ = 109180996.

The previous prime is 218361959. The next prime is 218362007. The reversal of 218361994 is 499163812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 161163025 + 57198969 = 12695^2 + 7563^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 218361994.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54590497 + ... + 54590500.

Almost surely, 2^218361994 is an apocalyptic number.

218361994 is a deficient number, since it is larger than the sum of its proper divisors (109181000).

218361994 is a wasteful number, since it uses less digits than its factorization.

218361994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109180999.

The product of its digits is 93312, while the sum is 43.

The square root of 218361994 is about 14777.0766391733. The cubic root of 218361994 is about 602.1791077164.

The spelling of 218361994 in words is "two hundred eighteen million, three hundred sixty-one thousand, nine hundred ninety-four".