228143809 has 2 divisors, whose sum is σ = 228143810. Its totient is φ = 228143808.

The previous prime is 228143759. The next prime is 228143819. The reversal of 228143809 is 908341822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212343184 + 15800625 = 14572^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 228143809 - 2⁹ = 228143297 is a prime.

It is not a weakly prime, because it can be changed into another prime (228143819) 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, 114071904 + 114071905.

It is an arithmetic number, because the mean of its divisors is an integer number (114071905).

Almost surely, 2^228143809 is an apocalyptic number.

It is an amenable number.

228143809 is a deficient number, since it is larger than the sum of its proper divisors (1).

228143809 is an equidigital number, since it uses as much as digits as its factorization.

228143809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 228143809 is about 15104.4301117255. The cubic root of 228143809 is about 611.0398897850.

The spelling of 228143809 in words is "two hundred twenty-eight million, one hundred forty-three thousand, eight hundred nine".