218112133 has 4 divisors (see below), whose sum is σ = 218146240. Its totient is φ = 218078028.

The previous prime is 218112107. The next prime is 218112173. The reversal of 218112133 is 331211812.

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 3-Lehmer number, since φ(218112133) divides (218112133-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218112133 is a prime.

It is a deceptive number, since it divides R_218112132.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218112173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4263 + ... + 21316.

It is an arithmetic number, because the mean of its divisors is an integer number (54536560).

Almost surely, 2^218112133 is an apocalyptic number.

218112133 is the 8527-th octagonal number.

It is an amenable number.

218112133 is a deficient number, since it is larger than the sum of its proper divisors (34107).

218112133 is an equidigital number, since it uses as much as digits as its factorization.

218112133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34106.

The product of its digits is 288, while the sum is 22.

The square root of 218112133 is about 14768.6198745854. The cubic root of 218112133 is about 601.9493386432.

Adding to 218112133 its reverse (331211812), we get a palindrome (549323945).

The spelling of 218112133 in words is "two hundred eighteen million, one hundred twelve thousand, one hundred thirty-three".