243121132545 has 8 divisors (see below), whose sum is σ = 388993812096. Its totient is φ = 129664604016.

The previous prime is 243121132517. The next prime is 243121132567. The reversal of 243121132545 is 545231121342.

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

It is not a de Polignac number, because 243121132545 - 2⁶ = 243121132481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8104037737 + ... + 8104037766.

It is an arithmetic number, because the mean of its divisors is an integer number (48624226512).

Almost surely, 2^243121132545 is an apocalyptic number.

It is an amenable number.

243121132545 is a deficient number, since it is larger than the sum of its proper divisors (145872679551).

243121132545 is a wasteful number, since it uses less digits than its factorization.

243121132545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16208075511.

The product of its digits is 28800, while the sum is 33.

Adding to 243121132545 its reverse (545231121342), we get a palindrome (788352253887).

The spelling of 243121132545 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred thirty-two thousand, five hundred forty-five".