228730217 has 2 divisors, whose sum is σ = 228730218. Its totient is φ = 228730216.

The previous prime is 228730211. The next prime is 228730231. The reversal of 228730217 is 712037822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209554576 + 19175641 = 14476^2 + 4379^2 .

It is a cyclic number.

It is not a de Polignac number, because 228730217 - 2¹⁴ = 228713833 is a prime.

It is a super-3 number, since 3×228730217³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228730211) 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, 114365108 + 114365109.

It is an arithmetic number, because the mean of its divisors is an integer number (114365109).

Almost surely, 2^228730217 is an apocalyptic number.

It is an amenable number.

228730217 is a deficient number, since it is larger than the sum of its proper divisors (1).

228730217 is an equidigital number, since it uses as much as digits as its factorization.

228730217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 228730217 is about 15123.8294423073. The cubic root of 228730217 is about 611.5629693843.

The spelling of 228730217 in words is "two hundred twenty-eight million, seven hundred thirty thousand, two hundred seventeen".