243121425525 has 72 divisors (see below), whose sum is σ = 502988413824. Its totient is φ = 110943091200.

The previous prime is 243121425523. The next prime is 243121425539. The reversal of 243121425525 is 525524121342.

243121425525 is a `hidden beast` number, since 2 + 4 + 3 + 121 + 4 + 2 + 5 + 525 = 666.

243121425525 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 243121425525 - 2¹ = 243121425523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121425525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121425523) 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 71 ways as a sum of consecutive naturals, for example, 2847069 + ... + 2931218.

It is an arithmetic number, because the mean of its divisors is an integer number (6985950192).

Almost surely, 2^243121425525 is an apocalyptic number.

243121425525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243121425525 is an abundant number, since it is smaller than the sum of its proper divisors (259866988299).

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

243121425525 is a wasteful number, since it uses less digits than its factorization.

243121425525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5778331 (or 5778323 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

Adding to 243121425525 its reverse (525524121342), we get a palindrome (768645546867).

The spelling of 243121425525 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred twenty-five thousand, five hundred twenty-five".