226815209 has 2 divisors, whose sum is σ = 226815210. Its totient is φ = 226815208.

The previous prime is 226815107. The next prime is 226815223. The reversal of 226815209 is 902518622.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193210000 + 33605209 = 13900^2 + 5797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-226815209 is a prime.

It is not a weakly prime, because it can be changed into another prime (226815299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113407604 + 113407605.

It is an arithmetic number, because the mean of its divisors is an integer number (113407605).

Almost surely, 2^226815209 is an apocalyptic number.

It is an amenable number.

226815209 is a deficient number, since it is larger than the sum of its proper divisors (1).

226815209 is an equidigital number, since it uses as much as digits as its factorization.

226815209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 226815209 is about 15060.3854200349. The cubic root of 226815209 is about 609.8514455057.

The spelling of 226815209 in words is "two hundred twenty-six million, eight hundred fifteen thousand, two hundred nine".