228828181 has 2 divisors, whose sum is σ = 228828182. Its totient is φ = 228828180.

The previous prime is 228828179. The next prime is 228828217. The reversal of 228828181 is 181828822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198951025 + 29877156 = 14105^2 + 5466^2 .

It is a cyclic number.

It is not a de Polignac number, because 228828181 - 2¹ = 228828179 is a prime.

It is a super-2 number, since 2×228828181² = 104724672839537522, which contains 22 as substring.

Together with 228828179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228828121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114414090 + 114414091.

It is an arithmetic number, because the mean of its divisors is an integer number (114414091).

Almost surely, 2^228828181 is an apocalyptic number.

It is an amenable number.

228828181 is a deficient number, since it is larger than the sum of its proper divisors (1).

228828181 is an equidigital number, since it uses as much as digits as its factorization.

228828181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32768, while the sum is 40.

The square root of 228828181 is about 15127.0678255900. The cubic root of 228828181 is about 611.6502667025.

The spelling of 228828181 in words is "two hundred twenty-eight million, eight hundred twenty-eight thousand, one hundred eighty-one".