243121153225 has 12 divisors (see below), whose sum is σ = 308823163740. Its totient is φ = 189753094400.

The previous prime is 243121153193. The next prime is 243121153271. The reversal of 243121153225 is 522351121342.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 81349877961 + 161771275264 = 285219^2 + 402208^2 .

It is not a de Polignac number, because 243121153225 - 2⁵ = 243121153193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118594660 + ... + 118596709.

It is an arithmetic number, because the mean of its divisors is an integer number (25735263645).

Almost surely, 2^243121153225 is an apocalyptic number.

243121153225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243121153225 is a deficient number, since it is larger than the sum of its proper divisors (65702010515).

243121153225 is a wasteful number, since it uses less digits than its factorization.

243121153225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237191420 (or 237191415 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

Adding to 243121153225 its reverse (522351121342), we get a palindrome (765472274567).

The spelling of 243121153225 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred fifty-three thousand, two hundred twenty-five".