1320243121913 has 2 divisors, whose sum is σ = 1320243121914. Its totient is φ = 1320243121912.

The previous prime is 1320243121867. The next prime is 1320243121927. The reversal of 1320243121913 is 3191213420231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1122406756969 + 197836364944 = 1059437^2 + 444788^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320243121913 - 2⁸ = 1320243121657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320243121913.

It is not a weakly prime, because it can be changed into another prime (1320243121013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660121560956 + 660121560957.

It is an arithmetic number, because the mean of its divisors is an integer number (660121560957).

Almost surely, 2^{1320243121913} is an apocalyptic number.

It is an amenable number.

1320243121913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320243121913 is an equidigital number, since it uses as much as digits as its factorization.

1320243121913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 1320243121913 in words is "one trillion, three hundred twenty billion, two hundred forty-three million, one hundred twenty-one thousand, nine hundred thirteen".