243305439997 has 2 divisors, whose sum is σ = 243305439998. Its totient is φ = 243305439996.

The previous prime is 243305439989. The next prime is 243305440043. The reversal of 243305439997 is 799934503342.

243305439997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161149256356 + 82156183641 = 401434^2 + 286629^2 .

It is a cyclic number.

It is not a de Polignac number, because 243305439997 - 2³ = 243305439989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243305439907) 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, 121652719998 + 121652719999.

It is an arithmetic number, because the mean of its divisors is an integer number (121652719999).

Almost surely, 2^243305439997 is an apocalyptic number.

It is an amenable number.

243305439997 is a deficient number, since it is larger than the sum of its proper divisors (1).

243305439997 is an equidigital number, since it uses as much as digits as its factorization.

243305439997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22044960, while the sum is 58.

The spelling of 243305439997 in words is "two hundred forty-three billion, three hundred five million, four hundred thirty-nine thousand, nine hundred ninety-seven".