243251205225 has 96 divisors (see below), whose sum is σ = 498536591616. Its totient is φ = 102106521600.

The previous prime is 243251205221. The next prime is 243251205271. The reversal of 243251205225 is 522502152342.

243251205225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243251205225 - 2² = 243251205221 is a prime.

It is a super-2 number, since 2×243251205225² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243251205221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33547 + ... + 698303.

It is an arithmetic number, because the mean of its divisors is an integer number (5193089496).

Almost surely, 2^243251205225 is an apocalyptic number.

243251205225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243251205225 is an abundant number, since it is smaller than the sum of its proper divisors (255285386391).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243251205225 is a wasteful number, since it uses less digits than its factorization.

243251205225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664835 (or 664830 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 243251205225 its reverse (522502152342), we get a palindrome (765753357567).

The spelling of 243251205225 in words is "two hundred forty-three billion, two hundred fifty-one million, two hundred five thousand, two hundred twenty-five".