1323131984509 has 2 divisors, whose sum is σ = 1323131984510. Its totient is φ = 1323131984508.

The previous prime is 1323131984399. The next prime is 1323131984569. The reversal of 1323131984509 is 9054891313231.

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., 1038106265625 + 285025718884 = 1018875^2 + 533878^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323131984509 - 2⁹ = 1323131983997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323131984569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661565992254 + 661565992255.

It is an arithmetic number, because the mean of its divisors is an integer number (661565992255).

Almost surely, 2^{1323131984509} is an apocalyptic number.

It is an amenable number.

1323131984509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323131984509 is an equidigital number, since it uses as much as digits as its factorization.

1323131984509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 1323131984509 in words is "one trillion, three hundred twenty-three billion, one hundred thirty-one million, nine hundred eighty-four thousand, five hundred nine".