11718191 has 2 divisors, whose sum is σ = 11718192. Its totient is φ = 11718190.

The previous prime is 11718137. The next prime is 11718199. The reversal of 11718191 is 19181711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11718191 - 2⁶ = 11718127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11718199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5859095 + 5859096.

It is an arithmetic number, because the mean of its divisors is an integer number (5859096).

Almost surely, 2^11718191 is an apocalyptic number.

11718191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11718191 is an equidigital number, since it uses as much as digits as its factorization.

11718191 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 11718191 is about 3423.1843362577. The cubic root of 11718191 is about 227.1364624185.

The spelling of 11718191 in words is "eleven million, seven hundred eighteen thousand, one hundred ninety-one".