11256997813 has 2 divisors, whose sum is σ = 11256997814. Its totient is φ = 11256997812.

The previous prime is 11256997789. The next prime is 11256997819. The reversal of 11256997813 is 31879965211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8985712849 + 2271284964 = 94793^2 + 47658^2 .

It is an emirp because it is prime and its reverse (31879965211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11256997813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11256997819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5628498906 + 5628498907.

It is an arithmetic number, because the mean of its divisors is an integer number (5628498907).

Almost surely, 2^11256997813 is an apocalyptic number.

It is an amenable number.

11256997813 is a deficient number, since it is larger than the sum of its proper divisors (1).

11256997813 is an equidigital number, since it uses as much as digits as its factorization.

11256997813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The spelling of 11256997813 in words is "eleven billion, two hundred fifty-six million, nine hundred ninety-seven thousand, eight hundred thirteen".