228688111 has 2 divisors, whose sum is σ = 228688112. Its totient is φ = 228688110.

The previous prime is 228688099. The next prime is 228688121. The reversal of 228688111 is 111886822.

It is a happy number.

228688111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228688111 - 2⁷ = 228687983 is a prime.

It is a super-2 number, since 2×228688111² = 104596504225496642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228688121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114344055 + 114344056.

It is an arithmetic number, because the mean of its divisors is an integer number (114344056).

Almost surely, 2^228688111 is an apocalyptic number.

228688111 is a deficient number, since it is larger than the sum of its proper divisors (1).

228688111 is an equidigital number, since it uses as much as digits as its factorization.

228688111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 37.

The square root of 228688111 is about 15122.4373366200. The cubic root of 228688111 is about 611.5254403818.

The spelling of 228688111 in words is "two hundred twenty-eight million, six hundred eighty-eight thousand, one hundred eleven".