1320256013 has 2 divisors, whose sum is σ = 1320256014. Its totient is φ = 1320256012.

The previous prime is 1320255973. The next prime is 1320256019. The reversal of 1320256013 is 3106520231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1280351524 + 39904489 = 35782^2 + 6317^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320256013 - 2¹⁰ = 1320254989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320256013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320256019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660128006 + 660128007.

It is an arithmetic number, because the mean of its divisors is an integer number (660128007).

Almost surely, 2^1320256013 is an apocalyptic number.

It is an amenable number.

1320256013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320256013 is an equidigital number, since it uses as much as digits as its factorization.

1320256013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1320256013 is about 36335.3273413079. The cubic root of 1320256013 is about 1097.0322241739.

Adding to 1320256013 its reverse (3106520231), we get a palindrome (4426776244).

The spelling of 1320256013 in words is "one billion, three hundred twenty million, two hundred fifty-six thousand, thirteen".