11891306797169 has 2 divisors, whose sum is σ = 11891306797170. Its totient is φ = 11891306797168.

The previous prime is 11891306797127. The next prime is 11891306797171. The reversal of 11891306797169 is 96179760319811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11778486720400 + 112820076769 = 3431980^2 + 335887^2 .

It is a cyclic number.

It is not a de Polignac number, because 11891306797169 - 2³² = 11887011829873 is a prime.

It is a super-2 number, since 2×11891306797169² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 11891306797171, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11891306797099 and 11891306797108.

It is not a weakly prime, because it can be changed into another prime (11891306797109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945653398584 + 5945653398585.

It is an arithmetic number, because the mean of its divisors is an integer number (5945653398585).

Almost surely, 2^{11891306797169} is an apocalyptic number.

It is an amenable number.

11891306797169 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891306797169 is an equidigital number, since it uses as much as digits as its factorization.

11891306797169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30862944, while the sum is 68.

The spelling of 11891306797169 in words is "eleven trillion, eight hundred ninety-one billion, three hundred six million, seven hundred ninety-seven thousand, one hundred sixty-nine".