227718809 has 2 divisors, whose sum is σ = 227718810. Its totient is φ = 227718808.

The previous prime is 227718779. The next prime is 227718811. The reversal of 227718809 is 908817722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207216025 + 20502784 = 14395^2 + 4528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-227718809 is a prime.

Together with 227718811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 227718809.

It is not a weakly prime, because it can be changed into another prime (227718209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113859404 + 113859405.

It is an arithmetic number, because the mean of its divisors is an integer number (113859405).

Almost surely, 2^227718809 is an apocalyptic number.

It is an amenable number.

227718809 is a deficient number, since it is larger than the sum of its proper divisors (1).

227718809 is an equidigital number, since it uses as much as digits as its factorization.

227718809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 227718809 is about 15090.3548334690. The cubic root of 227718809 is about 610.6602266565.

The spelling of 227718809 in words is "two hundred twenty-seven million, seven hundred eighteen thousand, eight hundred nine".