218038117 has 4 divisors (see below), whose sum is σ = 237859776. Its totient is φ = 198216460.

The previous prime is 218038109. The next prime is 218038147. The reversal of 218038117 is 711830812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218038117 - 2³ = 218038109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218038147) 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, 9910813 + ... + 9910834.

It is an arithmetic number, because the mean of its divisors is an integer number (59464944).

Almost surely, 2^218038117 is an apocalyptic number.

It is an amenable number.

218038117 is a deficient number, since it is larger than the sum of its proper divisors (19821659).

218038117 is a wasteful number, since it uses less digits than its factorization.

218038117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19821658.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 218038117 is about 14766.1138083112. The cubic root of 218038117 is about 601.8812407610.

Adding to 218038117 its reverse (711830812), we get a palindrome (929868929).

The spelling of 218038117 in words is "two hundred eighteen million, thirty-eight thousand, one hundred seventeen".