225605 has 4 divisors (see below), whose sum is σ = 270732.
Its totient is φ = 180480.
The previous prime is 225601. The next prime is 225611. The reversal of 225605 is 506522.
Adding to 225605 its sum of digits (20), we get a square (225625 = 4752).
It is a happy number.
225605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 37249 + 188356 = 193^2 + 434^2
It is not a de Polignac number, because 225605 - 22 = 225601 is a prime.
It is a Duffinian number.
It is a plaindrome in base 11.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (225601) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22556 + ... + 22565.
It is an arithmetic number, because the mean of its divisors is an integer number (67683).
2225605 is an apocalyptic number.
It is an amenable number.
225605 is a deficient number, since it is larger than the sum of its proper divisors (45127).
225605 is an equidigital number, since it uses as much as digits as its factorization.
225605 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 45126.
The product of its (nonzero) digits is 600, while the sum is 20.
The square root of 225605 is about 474.9789469019.
The cubic root of 225605 is about 60.8764857186.
The spelling of 225605 in words is "two hundred twenty-five thousand, six hundred five".