225181 has 6 divisors (see below), whose sum is σ = 247646. Its totient is φ = 204600.

The previous prime is 225167. The next prime is 225217. The reversal of 225181 is 181522.

225181 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in only one way, i.e., 116281 + 108900 = 341^2 + 330^2 .

It is not a de Polignac number, because 225181 - 2⁵ = 225149 is a prime.

It is a super-2 number, since 2×225181² = 101412965522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 810 + ... + 1051.

2²²⁵¹⁸¹ is an apocalyptic number.

It is an amenable number.

225181 is a deficient number, since it is larger than the sum of its proper divisors (22465).

225181 is a wasteful number, since it uses less digits than its factorization.

225181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883 (or 1872 counting only the distinct ones).

The product of its digits is 160, while the sum is 19.

The square root of 225181 is about 474.5324014227. The cubic root of 225181 is about 60.8383248964.

It can be divided in two parts, 2251 and 81, that added together give a palindrome (2332).

The spelling of 225181 in words is "two hundred twenty-five thousand, one hundred eighty-one".