243121554441 has 24 divisors (see below), whose sum is σ = 366477074496. Its totient is φ = 155020076640.

The previous prime is 243121554413. The next prime is 243121554461. The reversal of 243121554441 is 144455121342.

243121554441 is a `hidden beast` number, since 2 + 43 + 1 + 21 + 554 + 4 + 41 = 666.

It is not a de Polignac number, because 243121554441 - 2²¹ = 243119457289 is a prime.

It is a super-3 number, since 3×243121554441³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243121554396 and 243121554405.

It is not an unprimeable number, because it can be changed into a prime (243121554461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2563911 + ... + 2657043.

It is an arithmetic number, because the mean of its divisors is an integer number (15269878104).

Almost surely, 2^243121554441 is an apocalyptic number.

It is an amenable number.

243121554441 is a deficient number, since it is larger than the sum of its proper divisors (123355520055).

243121554441 is a wasteful number, since it uses less digits than its factorization.

243121554441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105773 (or 105770 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

Adding to 243121554441 its reverse (144455121342), we get a palindrome (387576675783).

The spelling of 243121554441 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred fifty-four thousand, four hundred forty-one".