228219281 has 2 divisors, whose sum is σ = 228219282. Its totient is φ = 228219280.

The previous prime is 228219247. The next prime is 228219289. The reversal of 228219281 is 182912822.

228219281 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 can be written as a sum of positive squares in only one way, i.e., 225480256 + 2739025 = 15016^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 228219281 - 2¹⁸ = 227957137 is a prime.

It is a super-2 number, since 2×228219281² = 104168080440313922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228219289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114109640 + 114109641.

It is an arithmetic number, because the mean of its divisors is an integer number (114109641).

Almost surely, 2^228219281 is an apocalyptic number.

It is an amenable number.

228219281 is a deficient number, since it is larger than the sum of its proper divisors (1).

228219281 is an equidigital number, since it uses as much as digits as its factorization.

228219281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 35.

The square root of 228219281 is about 15106.9282450139. The cubic root of 228219281 is about 611.1072614989.

The spelling of 228219281 in words is "two hundred twenty-eight million, two hundred nineteen thousand, two hundred eighty-one".