11891399291 has 2 divisors, whose sum is σ = 11891399292. Its totient is φ = 11891399290.

The previous prime is 11891399263. The next prime is 11891399297. The reversal of 11891399291 is 19299319811.

11891399291 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11891399291 is a prime.

It is not a weakly prime, because it can be changed into another prime (11891399297) 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, 5945699645 + 5945699646.

It is an arithmetic number, because the mean of its divisors is an integer number (5945699646).

Almost surely, 2^11891399291 is an apocalyptic number.

11891399291 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891399291 is an equidigital number, since it uses as much as digits as its factorization.

11891399291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 53.

The spelling of 11891399291 in words is "eleven billion, eight hundred ninety-one million, three hundred ninety-nine thousand, two hundred ninety-one".