225531243 has 32 divisors (see below), whose sum is σ = 392184320. Its totient is φ = 125388000.

The previous prime is 225531233. The next prime is 225531263. The reversal of 225531243 is 342135522.

It is a happy number.

It is not a de Polignac number, because 225531243 - 2¹² = 225527147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225531203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9133 + ... + 23118.

It is an arithmetic number, because the mean of its divisors is an integer number (12255760).

Almost surely, 2^225531243 is an apocalyptic number.

225531243 is a deficient number, since it is larger than the sum of its proper divisors (166653077).

225531243 is a wasteful number, since it uses less digits than its factorization.

225531243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32304 (or 32298 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 225531243 is about 15017.6976597613. The cubic root of 225531243 is about 608.6985088287.

Adding to 225531243 its reverse (342135522), we get a palindrome (567666765).

The spelling of 225531243 in words is "two hundred twenty-five million, five hundred thirty-one thousand, two hundred forty-three".