11778911 has 2 divisors, whose sum is σ = 11778912. Its totient is φ = 11778910.

The previous prime is 11778889. The next prime is 11778919. The reversal of 11778911 is 11987711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11778911 - 2⁶ = 11778847 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11778919) 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, 5889455 + 5889456.

It is an arithmetic number, because the mean of its divisors is an integer number (5889456).

Almost surely, 2^11778911 is an apocalyptic number.

11778911 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778911 is an equidigital number, since it uses as much as digits as its factorization.

11778911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 35.

The square root of 11778911 is about 3432.0418120996. The cubic root of 11778911 is about 227.5281034396.

The spelling of 11778911 in words is "eleven million, seven hundred seventy-eight thousand, nine hundred eleven".