225356809 has 2 divisors, whose sum is σ = 225356810. Its totient is φ = 225356808.

The previous prime is 225356773. The next prime is 225356821. The reversal of 225356809 is 908653522.

225356809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155550784 + 69806025 = 12472^2 + 8355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225356809 is a prime.

It is not a weakly prime, because it can be changed into another prime (225356849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112678404 + 112678405.

It is an arithmetic number, because the mean of its divisors is an integer number (112678405).

Almost surely, 2^225356809 is an apocalyptic number.

It is an amenable number.

225356809 is a deficient number, since it is larger than the sum of its proper divisors (1).

225356809 is an equidigital number, since it uses as much as digits as its factorization.

225356809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 225356809 is about 15011.8889217846. Note that the first 3 decimals coincide. The cubic root of 225356809 is about 608.5415385572.

The spelling of 225356809 in words is "two hundred twenty-five million, three hundred fifty-six thousand, eight hundred nine".