225342809 has 4 divisors (see below), whose sum is σ = 225881040. Its totient is φ = 224804580.

The previous prime is 225342797. The next prime is 225342829. The reversal of 225342809 is 908243522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 225342809 - 2⁸ = 225342553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225342829) 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 in 3 ways as a sum of consecutive naturals, for example, 268487 + ... + 269324.

It is an arithmetic number, because the mean of its divisors is an integer number (56470260).

Almost surely, 2^225342809 is an apocalyptic number.

It is an amenable number.

225342809 is a deficient number, since it is larger than the sum of its proper divisors (538231).

225342809 is an equidigital number, since it uses as much as digits as its factorization.

225342809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538230.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 225342809 is about 15011.4226174603. The cubic root of 225342809 is about 608.5289366778.

The spelling of 225342809 in words is "two hundred twenty-five million, three hundred forty-two thousand, eight hundred nine".