243097887689 has 2 divisors, whose sum is σ = 243097887690. Its totient is φ = 243097887688.

The previous prime is 243097887583. The next prime is 243097887719. The reversal of 243097887689 is 986788790342.

243097887689 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 can be written as a sum of positive squares in only one way, i.e., 189520915600 + 53576972089 = 435340^2 + 231467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243097887689 is a prime.

It is not a weakly prime, because it can be changed into another prime (243027887689) 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, 121548943844 + 121548943845.

It is an arithmetic number, because the mean of its divisors is an integer number (121548943845).

Almost surely, 2^243097887689 is an apocalyptic number.

It is an amenable number.

243097887689 is a deficient number, since it is larger than the sum of its proper divisors (1).

243097887689 is an equidigital number, since it uses as much as digits as its factorization.

243097887689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 292626432, while the sum is 71.

The spelling of 243097887689 in words is "two hundred forty-three billion, ninety-seven million, eight hundred eighty-seven thousand, six hundred eighty-nine".