225531 has 8 divisors (see below), whose sum is σ = 334160. Its totient is φ = 150336.

The previous prime is 225529. The next prime is 225569. The reversal of 225531 is 135522.

It is a happy number.

It is not a de Polignac number, because 225531 - 2¹ = 225529 is a prime.

It is a super-2 number, since 2×225531² = 101728463922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 225531.

It is not an unprimeable number, because it can be changed into a prime (225581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4150 + ... + 4203.

It is an arithmetic number, because the mean of its divisors is an integer number (41770).

2²²⁵⁵³¹ is an apocalyptic number.

225531 is a deficient number, since it is larger than the sum of its proper divisors (108629).

225531 is an equidigital number, since it uses as much as digits as its factorization.

225531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362 (or 8356 counting only the distinct ones).

The product of its digits is 300, while the sum is 18.

The square root of 225531 is about 474.9010423236. The cubic root of 225531 is about 60.8698290213.

Subtracting from 225531 its reverse (135522), we obtain a palindrome (90009).

The spelling of 225531 in words is "two hundred twenty-five thousand, five hundred thirty-one".