225047909 has 2 divisors, whose sum is σ = 225047910. Its totient is φ = 225047908.

The previous prime is 225047873. The next prime is 225047923. The reversal of 225047909 is 909740522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130530625 + 94517284 = 11425^2 + 9722^2 .

It is a cyclic number.

It is not a de Polignac number, because 225047909 - 2¹² = 225043813 is a prime.

It is a super-2 number, since 2×225047909² = 101293122690544562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_12385388 and since 225047909 and 12385388 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225040909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112523954 + 112523955.

It is an arithmetic number, because the mean of its divisors is an integer number (112523955).

Almost surely, 2^225047909 is an apocalyptic number.

It is an amenable number.

225047909 is a deficient number, since it is larger than the sum of its proper divisors (1).

225047909 is an equidigital number, since it uses as much as digits as its factorization.

225047909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 225047909 is about 15001.5968816656. The cubic root of 225047909 is about 608.2633657108.

The spelling of 225047909 in words is "two hundred twenty-five million, forty-seven thousand, nine hundred nine".