11111689 has 4 divisors (see below), whose sum is σ = 11121156. Its totient is φ = 11102224.

The previous prime is 11111687. The next prime is 11111701. The reversal of 11111689 is 98611111.

11111689 is digitally balanced in base 3, 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 2350089 = 2960^2 + 1533^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111689 - 2¹ = 11111687 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (11111687) 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, 2674 + ... + 5419.

It is an arithmetic number, because the mean of its divisors is an integer number (2780289).

Almost surely, 2^11111689 is an apocalyptic number.

It is an amenable number.

11111689 is a deficient number, since it is larger than the sum of its proper divisors (9467).

11111689 is an equidigital number, since it uses as much as digits as its factorization.

11111689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9466.

The product of its digits is 432, while the sum is 28.

The square root of 11111689 is about 3333.4200155396. The cubic root of 11111689 is about 223.1481852056.

The spelling of 11111689 in words is "eleven million, one hundred eleven thousand, six hundred eighty-nine".