225985 has 4 divisors (see below), whose sum is σ = 271188. Its totient is φ = 180784.

The previous prime is 225983. The next prime is 225989. The reversal of 225985 is 589522.

It is a happy number.

225985 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, and also an emirpimes, since its reverse is a distinct semiprime: 589522 = 2 ⋅294761.

It can be written as a sum of positive squares in 2 ways, for example, as 156816 + 69169 = 396^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 225985 - 2¹ = 225983 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (225983) 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, 22594 + ... + 22603.

It is an arithmetic number, because the mean of its divisors is an integer number (67797).

2²²⁵⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

225985 is a deficient number, since it is larger than the sum of its proper divisors (45203).

225985 is an equidigital number, since it uses as much as digits as its factorization.

225985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45202.

The product of its digits is 7200, while the sum is 31.

The square root of 225985 is about 475.3787963298. The cubic root of 225985 is about 60.9106458489.

The spelling of 225985 in words is "two hundred twenty-five thousand, nine hundred eighty-five".