11181947197 has 2 divisors, whose sum is σ = 11181947198. Its totient is φ = 11181947196.

The previous prime is 11181947177. The next prime is 11181947269. The reversal of 11181947197 is 79174918111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11175449796 + 6497401 = 105714^2 + 2549^2 .

It is an emirp because it is prime and its reverse (79174918111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11181947197 - 2¹¹ = 11181945149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11181947197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11181947137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5590973598 + 5590973599.

It is an arithmetic number, because the mean of its divisors is an integer number (5590973599).

Almost surely, 2^11181947197 is an apocalyptic number.

It is an amenable number.

11181947197 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181947197 is an equidigital number, since it uses as much as digits as its factorization.

11181947197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 49.

The spelling of 11181947197 in words is "eleven billion, one hundred eighty-one million, nine hundred forty-seven thousand, one hundred ninety-seven".