11778197 has 2 divisors, whose sum is σ = 11778198. Its totient is φ = 11778196.

The previous prime is 11778149. The next prime is 11778199. The reversal of 11778197 is 79187711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6584356 + 5193841 = 2566^2 + 2279^2 .

It is an emirp because it is prime and its reverse (79187711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11778197 - 2¹⁶ = 11712661 is a prime.

Together with 11778199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11778199) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889098 + 5889099.

It is an arithmetic number, because the mean of its divisors is an integer number (5889099).

Almost surely, 2^11778197 is an apocalyptic number.

It is an amenable number.

11778197 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778197 is an equidigital number, since it uses as much as digits as its factorization.

11778197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 41.

The square root of 11778197 is about 3431.9377908115. The cubic root of 11778197 is about 227.5235060042.

The spelling of 11778197 in words is "eleven million, seven hundred seventy-eight thousand, one hundred ninety-seven".