11511887 has 4 divisors (see below), whose sum is σ = 11599896. Its totient is φ = 11423880.

The previous prime is 11511833. The next prime is 11511893. The reversal of 11511887 is 78811511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78811511 = 113 ⋅697447.

It is a cyclic number.

It is not a de Polignac number, because 11511887 - 2⁶ = 11511823 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 (11514887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43808 + ... + 44069.

It is an arithmetic number, because the mean of its divisors is an integer number (2899974).

Almost surely, 2^11511887 is an apocalyptic number.

11511887 is a deficient number, since it is larger than the sum of its proper divisors (88009).

11511887 is an equidigital number, since it uses as much as digits as its factorization.

11511887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88008.

The product of its digits is 2240, while the sum is 32.

The square root of 11511887 is about 3392.9171814237. The cubic root of 11511887 is about 225.7956162492.

The spelling of 11511887 in words is "eleven million, five hundred eleven thousand, eight hundred eighty-seven".