11691169481 has 2 divisors, whose sum is σ = 11691169482. Its totient is φ = 11691169480.

The previous prime is 11691169463. The next prime is 11691169493. The reversal of 11691169481 is 18496119611.

It is a happy number.

11691169481 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., 9470403856 + 2220765625 = 97316^2 + 47125^2 .

It is a cyclic number.

It is not a de Polignac number, because 11691169481 - 2¹⁰ = 11691168457 is a prime.

It is a super-2 number, since 2×11691169481² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11691169181) 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, 5845584740 + 5845584741.

It is an arithmetic number, because the mean of its divisors is an integer number (5845584741).

Almost surely, 2^11691169481 is an apocalyptic number.

It is an amenable number.

11691169481 is a deficient number, since it is larger than the sum of its proper divisors (1).

11691169481 is an equidigital number, since it uses as much as digits as its factorization.

11691169481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 47.

The spelling of 11691169481 in words is "eleven billion, six hundred ninety-one million, one hundred sixty-nine thousand, four hundred eighty-one".