11556332191 has 2 divisors, whose sum is σ = 11556332192. Its totient is φ = 11556332190.

The previous prime is 11556332189. The next prime is 11556332279. The reversal of 11556332191 is 19123365511.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19123365511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11556332191 - 2¹ = 11556332189 is a prime.

Together with 11556332189, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 11556332191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11556332101) 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, 5778166095 + 5778166096.

It is an arithmetic number, because the mean of its divisors is an integer number (5778166096).

Almost surely, 2^11556332191 is an apocalyptic number.

11556332191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11556332191 is an equidigital number, since it uses as much as digits as its factorization.

11556332191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 37.

The spelling of 11556332191 in words is "eleven billion, five hundred fifty-six million, three hundred thirty-two thousand, one hundred ninety-one".