1243230302309 has 2 divisors, whose sum is σ = 1243230302310. Its totient is φ = 1243230302308.

The previous prime is 1243230302299. The next prime is 1243230302311. The reversal of 1243230302309 is 9032030323421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142166713284 + 101063589025 = 1068722^2 + 317905^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243230302309 - 2²⁰ = 1243229253733 is a prime.

Together with 1243230302311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243230302389) 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, 621615151154 + 621615151155.

It is an arithmetic number, because the mean of its divisors is an integer number (621615151155).

Almost surely, 2^{1243230302309} is an apocalyptic number.

It is an amenable number.

1243230302309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243230302309 is an equidigital number, since it uses as much as digits as its factorization.

1243230302309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 32.

The spelling of 1243230302309 in words is "one trillion, two hundred forty-three billion, two hundred thirty million, three hundred two thousand, three hundred nine".