228917917 has 2 divisors, whose sum is σ = 228917918. Its totient is φ = 228917916.

The previous prime is 228917911. The next prime is 228917921. The reversal of 228917917 is 719719822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115154361 + 113763556 = 10731^2 + 10666^2 .

It is a cyclic number.

It is not a de Polignac number, because 228917917 - 2¹⁹ = 228393629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228917911) 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, 114458958 + 114458959.

It is an arithmetic number, because the mean of its divisors is an integer number (114458959).

Almost surely, 2^228917917 is an apocalyptic number.

It is an amenable number.

228917917 is a deficient number, since it is larger than the sum of its proper divisors (1).

228917917 is an equidigital number, since it uses as much as digits as its factorization.

228917917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 46.

The square root of 228917917 is about 15130.0336086871. The cubic root of 228917917 is about 611.7302100540.

The spelling of 228917917 in words is "two hundred twenty-eight million, nine hundred seventeen thousand, nine hundred seventeen".