243123340289 has 2 divisors, whose sum is σ = 243123340290. Its totient is φ = 243123340288.

The previous prime is 243123340189. The next prime is 243123340331. The reversal of 243123340289 is 982043321342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242812417600 + 310922689 = 492760^2 + 17633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243123340289 is a prime.

It is not a weakly prime, because it can be changed into another prime (243123340189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561670144 + 121561670145.

It is an arithmetic number, because the mean of its divisors is an integer number (121561670145).

Almost surely, 2^243123340289 is an apocalyptic number.

It is an amenable number.

243123340289 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123340289 is an equidigital number, since it uses as much as digits as its factorization.

243123340289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 243123340289 in words is "two hundred forty-three billion, one hundred twenty-three million, three hundred forty thousand, two hundred eighty-nine".