228138111 has 12 divisors (see below), whose sum is σ = 346876920. Its totient is φ = 144087120.

The previous prime is 228138089. The next prime is 228138151. The reversal of 228138111 is 111831822.

228138111 is a `hidden beast` number, since 2 + 281 + 381 + 1 + 1 = 666.

It is not a de Polignac number, because 228138111 - 2¹⁰ = 228137087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228138151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666900 + ... + 667241.

It is an arithmetic number, because the mean of its divisors is an integer number (28906410).

Almost surely, 2^228138111 is an apocalyptic number.

228138111 is a deficient number, since it is larger than the sum of its proper divisors (118738809).

228138111 is a wasteful number, since it uses less digits than its factorization.

228138111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334166 (or 1334163 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 228138111 is about 15104.2414903894. The cubic root of 228138111 is about 611.0348027388.

Adding to 228138111 its reverse (111831822), we get a palindrome (339969933).

The spelling of 228138111 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, one hundred eleven".