243115243331 has 2 divisors, whose sum is σ = 243115243332. Its totient is φ = 243115243330.

The previous prime is 243115243313. The next prime is 243115243363. The reversal of 243115243331 is 133342511342.

243115243331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (243115243313) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (243115243363) can be obtained adding 243115243331 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243115243331 is a prime.

It is a super-2 number, since 2×243115243331² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (243115243381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121557621665 + 121557621666.

It is an arithmetic number, because the mean of its divisors is an integer number (121557621666).

Almost surely, 2^243115243331 is an apocalyptic number.

243115243331 is a deficient number, since it is larger than the sum of its proper divisors (1).

243115243331 is an equidigital number, since it uses as much as digits as its factorization.

243115243331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 32.

Adding to 243115243331 its reverse (133342511342), we get a palindrome (376457754673).

The spelling of 243115243331 in words is "two hundred forty-three billion, one hundred fifteen million, two hundred forty-three thousand, three hundred thirty-one".