228380809 has 2 divisors, whose sum is σ = 228380810. Its totient is φ = 228380808.

The previous prime is 228380791. The next prime is 228380819. The reversal of 228380809 is 908083822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222606400 + 5774409 = 14920^2 + 2403^2 .

It is a cyclic number.

It is not a de Polignac number, because 228380809 - 2⁹ = 228380297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228380819) 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, 114190404 + 114190405.

It is an arithmetic number, because the mean of its divisors is an integer number (114190405).

Almost surely, 2^228380809 is an apocalyptic number.

It is an amenable number.

228380809 is a deficient number, since it is larger than the sum of its proper divisors (1).

228380809 is an equidigital number, since it uses as much as digits as its factorization.

228380809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 228380809 is about 15112.2734557048. The cubic root of 228380809 is about 611.2514030661.

The spelling of 228380809 in words is "two hundred twenty-eight million, three hundred eighty thousand, eight hundred nine".