228116909 has 2 divisors, whose sum is σ = 228116910. Its totient is φ = 228116908.

The previous prime is 228116821. The next prime is 228116923. The reversal of 228116909 is 909611822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203861284 + 24255625 = 14278^2 + 4925^2 .

It is a cyclic number.

It is not a de Polignac number, because 228116909 - 2¹² = 228112813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228116969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114058454 + 114058455.

It is an arithmetic number, because the mean of its divisors is an integer number (114058455).

Almost surely, 2^228116909 is an apocalyptic number.

It is an amenable number.

228116909 is a deficient number, since it is larger than the sum of its proper divisors (1).

228116909 is an equidigital number, since it uses as much as digits as its factorization.

228116909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 228116909 is about 15103.5396182484. The cubic root of 228116909 is about 611.0158733263.

The spelling of 228116909 in words is "two hundred twenty-eight million, one hundred sixteen thousand, nine hundred nine".