228789217 has 2 divisors, whose sum is σ = 228789218. Its totient is φ = 228789216.

The previous prime is 228789173. The next prime is 228789259. The reversal of 228789217 is 712987822.

It is a happy number.

228789217 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., 144865296 + 83923921 = 12036^2 + 9161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228789217 is a prime.

It is not a weakly prime, because it can be changed into another prime (228789017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114394608 + 114394609.

It is an arithmetic number, because the mean of its divisors is an integer number (114394609).

Almost surely, 2^228789217 is an apocalyptic number.

It is an amenable number.

228789217 is a deficient number, since it is larger than the sum of its proper divisors (1).

228789217 is an equidigital number, since it uses as much as digits as its factorization.

228789217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 228789217 is about 15125.7798807202. The cubic root of 228789217 is about 611.6155482313.

The spelling of 228789217 in words is "two hundred twenty-eight million, seven hundred eighty-nine thousand, two hundred seventeen".