243123346331 has 2 divisors, whose sum is σ = 243123346332. Its totient is φ = 243123346330.

The previous prime is 243123346313. The next prime is 243123346357. The reversal of 243123346331 is 133643321342.

Together with previous prime (243123346313) 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 243123346331 - 2¹⁰ = 243123345307 is a prime.

It is a super-2 number, since 2×243123346331² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 243123346291 and 243123346300.

It is not a weakly prime, because it can be changed into another prime (243123346031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561673165 + 121561673166.

It is an arithmetic number, because the mean of its divisors is an integer number (121561673166).

Almost surely, 2^243123346331 is an apocalyptic number.

243123346331 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123346331 is an equidigital number, since it uses as much as digits as its factorization.

243123346331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 35.

Adding to 243123346331 its reverse (133643321342), we get a palindrome (376766667673).

The spelling of 243123346331 in words is "two hundred forty-three billion, one hundred twenty-three million, three hundred forty-six thousand, three hundred thirty-one".