243243309307 has 2 divisors, whose sum is σ = 243243309308. Its totient is φ = 243243309306.

The previous prime is 243243309301. The next prime is 243243309319. The reversal of 243243309307 is 703903342342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243243309307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243243309307.

It is not a weakly prime, because it can be changed into another prime (243243309301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121621654653 + 121621654654.

It is an arithmetic number, because the mean of its divisors is an integer number (121621654654).

Almost surely, 2^243243309307 is an apocalyptic number.

243243309307 is a deficient number, since it is larger than the sum of its proper divisors (1).

243243309307 is an equidigital number, since it uses as much as digits as its factorization.

243243309307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 40.

The spelling of 243243309307 in words is "two hundred forty-three billion, two hundred forty-three million, three hundred nine thousand, three hundred seven".