243297140309 has 2 divisors, whose sum is σ = 243297140310. Its totient is φ = 243297140308.

The previous prime is 243297140299. The next prime is 243297140363. The reversal of 243297140309 is 903041792342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235719960100 + 7577180209 = 485510^2 + 87047^2 .

It is a cyclic number.

It is not a de Polignac number, because 243297140309 - 2²⁰ = 243296091733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243297140309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243297140209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121648570154 + 121648570155.

It is an arithmetic number, because the mean of its divisors is an integer number (121648570155).

Almost surely, 2^243297140309 is an apocalyptic number.

It is an amenable number.

243297140309 is a deficient number, since it is larger than the sum of its proper divisors (1).

243297140309 is an equidigital number, since it uses as much as digits as its factorization.

243297140309 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 44.

The spelling of 243297140309 in words is "two hundred forty-three billion, two hundred ninety-seven million, one hundred forty thousand, three hundred nine".