243121244554 has 8 divisors (see below), whose sum is σ = 365600462148. Its totient is φ = 121254423840.

The previous prime is 243121244417. The next prime is 243121244557. The reversal of 243121244554 is 455442121342.

243121244554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 228775673025 + 14345571529 = 478305^2 + 119773^2 .

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

It is not an unprimeable number, because it can be changed into a prime (243121244557) 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 3 ways as a sum of consecutive naturals, for example, 153098227 + ... + 153099814.

Almost surely, 2^243121244554 is an apocalyptic number.

243121244554 is a deficient number, since it is larger than the sum of its proper divisors (122479217594).

243121244554 is a wasteful number, since it uses less digits than its factorization.

243121244554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306198440.

The product of its digits is 153600, while the sum is 37.

Adding to 243121244554 its reverse (455442121342), we get a palindrome (698563365896).

The spelling of 243121244554 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-four thousand, five hundred fifty-four".