243121112431 has 2 divisors, whose sum is σ = 243121112432. Its totient is φ = 243121112430.

The previous prime is 243121112413. The next prime is 243121112537. The reversal of 243121112431 is 134211121342.

Together with previous prime (243121112413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243121112431 - 2¹¹ = 243121110383 is a prime.

It is a super-2 number, since 2×243121112431² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243121112396 and 243121112405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121112231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560556215 + 121560556216.

It is an arithmetic number, because the mean of its divisors is an integer number (121560556216).

Almost surely, 2^243121112431 is an apocalyptic number.

243121112431 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121112431 is an equidigital number, since it uses as much as digits as its factorization.

243121112431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

Adding to 243121112431 its reverse (134211121342), we get a palindrome (377332233773).

The spelling of 243121112431 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred twelve thousand, four hundred thirty-one".