243121024545 has 256 divisors, whose sum is σ = 491957452800. Its totient is φ = 100143267840.

The previous prime is 243121024519. The next prime is 243121024561. The reversal of 243121024545 is 545420121342.

It is not a de Polignac number, because 243121024545 - 2¹³ = 243121016353 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 361249329 + ... + 361250001.

It is an arithmetic number, because the mean of its divisors is an integer number (1921708800).

Almost surely, 2^243121024545 is an apocalyptic number.

It is an amenable number.

243121024545 is an abundant number, since it is smaller than the sum of its proper divisors (248836428255).

243121024545 is a wasteful number, since it uses less digits than its factorization.

243121024545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 243121024545 its reverse (545420121342), we get a palindrome (788541145887).

The spelling of 243121024545 in words is "two hundred forty-three billion, one hundred twenty-one million, twenty-four thousand, five hundred forty-five".