228255809 has 2 divisors, whose sum is σ = 228255810. Its totient is φ = 228255808.

The previous prime is 228255803. The next prime is 228255817. The reversal of 228255809 is 908552822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227919409 + 336400 = 15097^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 228255809 - 2⁴ = 228255793 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (228255803) 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, 114127904 + 114127905.

It is an arithmetic number, because the mean of its divisors is an integer number (114127905).

Almost surely, 2^228255809 is an apocalyptic number.

It is an amenable number.

228255809 is a deficient number, since it is larger than the sum of its proper divisors (1).

228255809 is an equidigital number, since it uses as much as digits as its factorization.

228255809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 228255809 is about 15108.1371783552. The cubic root of 228255809 is about 611.1398636744.

The spelling of 228255809 in words is "two hundred twenty-eight million, two hundred fifty-five thousand, eight hundred nine".