225998009 has 2 divisors, whose sum is σ = 225998010. Its totient is φ = 225998008.

The previous prime is 225997969. The next prime is 225998081. The reversal of 225998009 is 900899522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222010000 + 3988009 = 14900^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 225998009 - 2⁸ = 225997753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (225998099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112999004 + 112999005.

It is an arithmetic number, because the mean of its divisors is an integer number (112999005).

Almost surely, 2^225998009 is an apocalyptic number.

It is an amenable number.

225998009 is a deficient number, since it is larger than the sum of its proper divisors (1).

225998009 is an equidigital number, since it uses as much as digits as its factorization.

225998009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 225998009 is about 15033.2301585521. The cubic root of 225998009 is about 609.1181461584.

The spelling of 225998009 in words is "two hundred twenty-five million, nine hundred ninety-eight thousand, nine".