243121535542 has 8 divisors (see below), whose sum is σ = 367129836000. Its totient is φ = 120744923544.

The previous prime is 243121535513. The next prime is 243121535597. The reversal of 243121535542 is 245535121342.

It is a happy number.

243121535542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 407921742 + ... + 407922337.

It is an arithmetic number, because the mean of its divisors is an integer number (45891229500).

Almost surely, 2^243121535542 is an apocalyptic number.

243121535542 is a deficient number, since it is larger than the sum of its proper divisors (124008300458).

243121535542 is a wasteful number, since it uses less digits than its factorization.

243121535542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815844230.

The product of its digits is 144000, while the sum is 37.

Adding to 243121535542 its reverse (245535121342), we get a palindrome (488656656884).

The spelling of 243121535542 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred thirty-five thousand, five hundred forty-two".