243121245545 has 16 divisors (see below), whose sum is σ = 298783883520. Its totient is φ = 189858984000.

The previous prime is 243121245527. The next prime is 243121245599. The reversal of 243121245545 is 545542121342.

It is a de Polignac number, because none of the positive numbers 2^k-243121245545 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243121245499 and 243121245508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3354485 + ... + 3426194.

It is an arithmetic number, because the mean of its divisors is an integer number (18673992720).

Almost surely, 2^243121245545 is an apocalyptic number.

It is an amenable number.

243121245545 is a deficient number, since it is larger than the sum of its proper divisors (55662637975).

243121245545 is a wasteful number, since it uses less digits than its factorization.

243121245545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780856.

The product of its digits is 192000, while the sum is 38.

Adding to 243121245545 its reverse (545542121342), we get a palindrome (788663366887).

The spelling of 243121245545 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, five hundred forty-five".