11817191 has 2 divisors, whose sum is σ = 11817192. Its totient is φ = 11817190.

The previous prime is 11817161. The next prime is 11817199. The reversal of 11817191 is 19171811.

11817191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11817191 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11817199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5908595 + 5908596.

It is an arithmetic number, because the mean of its divisors is an integer number (5908596).

Almost surely, 2^11817191 is an apocalyptic number.

11817191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11817191 is an equidigital number, since it uses as much as digits as its factorization.

11817191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 29.

The square root of 11817191 is about 3437.6141435595. The cubic root of 11817191 is about 227.7743162847.

The spelling of 11817191 in words is "eleven million, eight hundred seventeen thousand, one hundred ninety-one".