11311995917 has 2 divisors, whose sum is σ = 11311995918. Its totient is φ = 11311995916.

The previous prime is 11311995841. The next prime is 11311995923. The reversal of 11311995917 is 71959911311.

It is a happy number.

11311995917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8602377001 + 2709618916 = 92749^2 + 52054^2 .

It is an emirp because it is prime and its reverse (71959911311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11311995917 - 2²² = 11307801613 is a prime.

It is a super-2 number, since 2×11311995917² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11311991917) 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, 5655997958 + 5655997959.

It is an arithmetic number, because the mean of its divisors is an integer number (5655997959).

Almost surely, 2^11311995917 is an apocalyptic number.

It is an amenable number.

11311995917 is a deficient number, since it is larger than the sum of its proper divisors (1).

11311995917 is an equidigital number, since it uses as much as digits as its factorization.

11311995917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76545, while the sum is 47.

The spelling of 11311995917 in words is "eleven billion, three hundred eleven million, nine hundred ninety-five thousand, nine hundred seventeen".