243043325531 has 2 divisors, whose sum is σ = 243043325532. Its totient is φ = 243043325530.

The previous prime is 243043325527. The next prime is 243043325533. The reversal of 243043325531 is 135523340342.

243043325531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243043325531 - 2² = 243043325527 is a prime.

It is a super-2 number, since 2×243043325531² (a number of 24 digits) contains 22 as substring.

Together with 243043325533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 243043325491 and 243043325500.

It is not a weakly prime, because it can be changed into another prime (243043325533) 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, 121521662765 + 121521662766.

It is an arithmetic number, because the mean of its divisors is an integer number (121521662766).

Almost surely, 2^243043325531 is an apocalyptic number.

243043325531 is a deficient number, since it is larger than the sum of its proper divisors (1).

243043325531 is an equidigital number, since it uses as much as digits as its factorization.

243043325531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 35.

Adding to 243043325531 its reverse (135523340342), we get a palindrome (378566665873).

The spelling of 243043325531 in words is "two hundred forty-three billion, forty-three million, three hundred twenty-five thousand, five hundred thirty-one".