225544 has 24 divisors (see below), whose sum is σ = 466830. Its totient is φ = 102080.

The previous prime is 225529. The next prime is 225569. The reversal of 225544 is 445522.

225544 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 12100 = 462^2 + 110^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a zygodrome in base 10.

It is an unprimeable number.

225544 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 852 + ... + 1084.

2²²⁵⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233415).

225544 is an abundant number, since it is smaller than the sum of its proper divisors (241286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225544 is a wasteful number, since it uses less digits than its factorization.

225544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 246 counting only the distinct ones).

The product of its digits is 1600, while the sum is 22.

The square root of 225544 is about 474.9147291883. The cubic root of 225544 is about 60.8709985466.

Subtracting from 225544 its sum of digits (22), we obtain a palindrome (225522).

The spelling of 225544 in words is "two hundred twenty-five thousand, five hundred forty-four".