11511889 has 4 divisors (see below), whose sum is σ = 11589300. Its totient is φ = 11434480.

The previous prime is 11511833. The next prime is 11511893. The reversal of 11511889 is 98811511.

11511889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4840000 + 6671889 = 2200^2 + 2583^2 .

It is a cyclic number.

It is not a de Polignac number, because 11511889 - 2⁹ = 11511377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11511089) 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, 38482 + ... + 38779.

It is an arithmetic number, because the mean of its divisors is an integer number (2897325).

Almost surely, 2^11511889 is an apocalyptic number.

It is an amenable number.

11511889 is a deficient number, since it is larger than the sum of its proper divisors (77411).

11511889 is an equidigital number, since it uses as much as digits as its factorization.

11511889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77410.

The product of its digits is 2880, while the sum is 34.

The square root of 11511889 is about 3392.9174761553. The cubic root of 11511889 is about 225.7956293253.

The spelling of 11511889 in words is "eleven million, five hundred eleven thousand, eight hundred eighty-nine".