243121544431 has 2 divisors, whose sum is σ = 243121544432. Its totient is φ = 243121544430.

The previous prime is 243121544357. The next prime is 243121544441. The reversal of 243121544431 is 134445121342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243121544431 - 2¹³ = 243121536239 is a prime.

It is a super-2 number, since 2×243121544431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121544441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560772215 + 121560772216.

It is an arithmetic number, because the mean of its divisors is an integer number (121560772216).

Almost surely, 2^243121544431 is an apocalyptic number.

243121544431 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121544431 is an equidigital number, since it uses as much as digits as its factorization.

243121544431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 34.

Adding to 243121544431 its reverse (134445121342), we get a palindrome (377566665773).

The spelling of 243121544431 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred forty-four thousand, four hundred thirty-one".