228511111 has 2 divisors, whose sum is σ = 228511112. Its totient is φ = 228511110.

The previous prime is 228511109. The next prime is 228511117. The reversal of 228511111 is 111115822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228511111 - 2¹ = 228511109 is a prime.

Together with 228511109, it forms a pair of twin primes.

It is a Chen prime.

228511111 is a modest number, since divided by 11111 gives 2285 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228511117) 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 as a sum of consecutive naturals, namely, 114255555 + 114255556.

It is an arithmetic number, because the mean of its divisors is an integer number (114255556).

Almost surely, 2^228511111 is an apocalyptic number.

228511111 is a deficient number, since it is larger than the sum of its proper divisors (1).

228511111 is an equidigital number, since it uses as much as digits as its factorization.

228511111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160, while the sum is 22.

The square root of 228511111 is about 15116.5839725779. The cubic root of 228511111 is about 611.3676301956.

Adding to 228511111 its reverse (111115822), we get a palindrome (339626933).

The spelling of 228511111 in words is "two hundred twenty-eight million, five hundred eleven thousand, one hundred eleven".