218513242 has 4 divisors (see below), whose sum is σ = 327769866. Its totient is φ = 109256620.

The previous prime is 218513237. The next prime is 218513261. The reversal of 218513242 is 242315812.

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., 214944921 + 3568321 = 14661^2 + 1889^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 218513242.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54628309 + ... + 54628312.

Almost surely, 2^218513242 is an apocalyptic number.

218513242 is a deficient number, since it is larger than the sum of its proper divisors (109256624).

218513242 is a wasteful number, since it uses less digits than its factorization.

218513242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109256623.

The product of its digits is 3840, while the sum is 28.

The square root of 218513242 is about 14782.1934096399. The cubic root of 218513242 is about 602.3181083481.

The spelling of 218513242 in words is "two hundred eighteen million, five hundred thirteen thousand, two hundred forty-two".