11511671 has 4 divisors (see below), whose sum is σ = 11525592. Its totient is φ = 11497752.

The previous prime is 11511623. The next prime is 11511679. The reversal of 11511671 is 17611511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17611511 = 47 ⋅374713.

It is a cyclic number.

It is not a de Polignac number, because 11511671 - 2⁶ = 11511607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11511679) 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 3 ways as a sum of consecutive naturals, for example, 5636 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (2881398).

Almost surely, 2^11511671 is an apocalyptic number.

11511671 is a deficient number, since it is larger than the sum of its proper divisors (13921).

11511671 is an equidigital number, since it uses as much as digits as its factorization.

11511671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13920.

The product of its digits is 210, while the sum is 23.

The square root of 11511671 is about 3392.8853502587. The cubic root of 11511671 is about 225.7942040232.

The spelling of 11511671 in words is "eleven million, five hundred eleven thousand, six hundred seventy-one".