11491191 has 24 divisors (see below), whose sum is σ = 17736576. Its totient is φ = 7151760.

The previous prime is 11491187. The next prime is 11491199. The reversal of 11491191 is 19119411.

It is not a de Polignac number, because 11491191 - 2² = 11491187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11491199) 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 in 23 ways as a sum of consecutive naturals, for example, 8256 + ... + 9546.

It is an arithmetic number, because the mean of its divisors is an integer number (739024).

Almost surely, 2^11491191 is an apocalyptic number.

11491191 is a deficient number, since it is larger than the sum of its proper divisors (6245385).

11491191 is a wasteful number, since it uses less digits than its factorization.

11491191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363 (or 1360 counting only the distinct ones).

The product of its digits is 324, while the sum is 27.

The square root of 11491191 is about 3389.8659265523. The cubic root of 11491191 is about 225.6602237551.

The spelling of 11491191 in words is "eleven million, four hundred ninety-one thousand, one hundred ninety-one".