1323538043809 has 2 divisors, whose sum is σ = 1323538043810. Its totient is φ = 1323538043808.

The previous prime is 1323538043743. The next prime is 1323538043851. The reversal of 1323538043809 is 9083408353231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221411780625 + 102126263184 = 1105175^2 + 319572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323538043809 - 2²⁹ = 1323001172897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1323538043609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661769021904 + 661769021905.

It is an arithmetic number, because the mean of its divisors is an integer number (661769021905).

Almost surely, 2^{1323538043809} is an apocalyptic number.

It is an amenable number.

1323538043809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323538043809 is an equidigital number, since it uses as much as digits as its factorization.

1323538043809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 1323538043809 in words is "one trillion, three hundred twenty-three billion, five hundred thirty-eight million, forty-three thousand, eight hundred nine".