11511191 has 2 divisors, whose sum is σ = 11511192. Its totient is φ = 11511190.

The previous prime is 11511139. The next prime is 11511209. The reversal of 11511191 is 19111511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11511191 - 2¹⁰ = 11510167 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 (11511391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755595 + 5755596.

It is an arithmetic number, because the mean of its divisors is an integer number (5755596).

Almost surely, 2^11511191 is an apocalyptic number.

11511191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511191 is an equidigital number, since it uses as much as digits as its factorization.

11511191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45, while the sum is 20.

The square root of 11511191 is about 3392.8146132673. The cubic root of 11511191 is about 225.7910656800.

The spelling of 11511191 in words is "eleven million, five hundred eleven thousand, one hundred ninety-one".