243115225 has 12 divisors (see below), whose sum is σ = 302423724. Its totient is φ = 193872320.

The previous prime is 243115183. The next prime is 243115247. The reversal of 243115225 is 522511342.

It can be written as a sum of positive squares in 6 ways, for example, as 19642624 + 223472601 = 4432^2 + 14949^2 .

It is not a de Polignac number, because 243115225 - 2⁹ = 243114713 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 243115225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7414 + ... + 23263.

It is an arithmetic number, because the mean of its divisors is an integer number (25201977).

Almost surely, 2^243115225 is an apocalyptic number.

243115225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243115225 is a deficient number, since it is larger than the sum of its proper divisors (59308499).

243115225 is a wasteful number, since it uses less digits than its factorization.

243115225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31004 (or 30999 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 243115225 is about 15592.1526737010. The cubic root of 243115225 is about 624.1237641112.

Adding to 243115225 its reverse (522511342), we get a palindrome (765626567).

The spelling of 243115225 in words is "two hundred forty-three million, one hundred fifteen thousand, two hundred twenty-five".