243331225 has 12 divisors (see below), whose sum is σ = 302503084. Its totient is φ = 194166720.

The previous prime is 243331223. The next prime is 243331241. The reversal of 243331225 is 522133342.

It can be written as a sum of positive squares in 6 ways, for example, as 10188864 + 233142361 = 3192^2 + 15269^2 .

It is not a de Polignac number, because 243331225 - 2¹ = 243331223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243331225.

It is not an unprimeable number, because it can be changed into a prime (243331223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2334 + ... + 22183.

Almost surely, 2^243331225 is an apocalyptic number.

243331225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243331225 is a deficient number, since it is larger than the sum of its proper divisors (59171859).

243331225 is a wasteful number, since it uses less digits than its factorization.

243331225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24924 (or 24919 counting only the distinct ones).

The product of its digits is 4320, while the sum is 25.

The square root of 243331225 is about 15599.0776970948. The cubic root of 243331225 is about 624.3085473112.

Adding to 243331225 its reverse (522133342), we get a palindrome (765464567).

The spelling of 243331225 in words is "two hundred forty-three million, three hundred thirty-one thousand, two hundred twenty-five".