243121112545 has 8 divisors (see below), whose sum is σ = 291756637224. Its totient is φ = 194489355264.

The previous prime is 243121112537. The next prime is 243121112569. The reversal of 243121112545 is 545211121342.

243121112545 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 4 ways, for example, as 17679425296 + 225441687249 = 132964^2 + 474807^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 243121112545 - 2³ = 243121112537 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 797874 + ... + 1059643.

It is an arithmetic number, because the mean of its divisors is an integer number (36469579653).

Almost surely, 2^243121112545 is an apocalyptic number.

It is an amenable number.

243121112545 is a deficient number, since it is larger than the sum of its proper divisors (48635524679).

243121112545 is a wasteful number, since it uses less digits than its factorization.

243121112545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883699.

The product of its digits is 9600, while the sum is 31.

Adding to 243121112545 its reverse (545211121342), we get a palindrome (788332233887).

The spelling of 243121112545 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred twelve thousand, five hundred forty-five".