11211911197 has 2 divisors, whose sum is σ = 11211911198. Its totient is φ = 11211911196.

The previous prime is 11211911149. The next prime is 11211911257. The reversal of 11211911197 is 79111911211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10963974681 + 247936516 = 104709^2 + 15746^2 .

It is an emirp because it is prime and its reverse (79111911211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211911197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211911297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605955598 + 5605955599.

It is an arithmetic number, because the mean of its divisors is an integer number (5605955599).

Almost surely, 2^11211911197 is an apocalyptic number.

It is an amenable number.

11211911197 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211911197 is an equidigital number, since it uses as much as digits as its factorization.

11211911197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 34.

The spelling of 11211911197 in words is "eleven billion, two hundred eleven million, nine hundred eleven thousand, one hundred ninety-seven".