243136326409 has 2 divisors, whose sum is σ = 243136326410. Its totient is φ = 243136326408.

The previous prime is 243136326403. The next prime is 243136326427. The reversal of 243136326409 is 904623631342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144854076409 + 98282250000 = 380597^2 + 313500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243136326409 is a prime.

It is not a weakly prime, because it can be changed into another prime (243136326403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121568163204 + 121568163205.

It is an arithmetic number, because the mean of its divisors is an integer number (121568163205).

Almost surely, 2^243136326409 is an apocalyptic number.

It is an amenable number.

243136326409 is a deficient number, since it is larger than the sum of its proper divisors (1).

243136326409 is an equidigital number, since it uses as much as digits as its factorization.

243136326409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 243136326409 in words is "two hundred forty-three billion, one hundred thirty-six million, three hundred twenty-six thousand, four hundred nine".