243117731325643 has 2 divisors, whose sum is σ = 243117731325644. Its totient is φ = 243117731325642.

The previous prime is 243117731325631. The next prime is 243117731325691. The reversal of 243117731325643 is 346523137711342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243117731325643 is a prime.

It is not a weakly prime, because it can be changed into another prime (243117731320643) 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, 121558865662821 + 121558865662822.

It is an arithmetic number, because the mean of its divisors is an integer number (121558865662822).

Almost surely, 2^{243117731325643} is an apocalyptic number.

243117731325643 is a deficient number, since it is larger than the sum of its proper divisors (1).

243117731325643 is an equidigital number, since it uses as much as digits as its factorization.

243117731325643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 52.

The spelling of 243117731325643 in words is "two hundred forty-three trillion, one hundred seventeen billion, seven hundred thirty-one million, three hundred twenty-five thousand, six hundred forty-three".