2166111 has 12 divisors (see below), whose sum is σ = 3145480. Its totient is φ = 1436400.

The previous prime is 2166077. The next prime is 2166113. The reversal of 2166111 is 1116612.

2166111 is a `hidden beast` number, since 2 + 1 + 661 + 1 + 1 = 666.

2166111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2166111 - 2⁹ = 2165599 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 (2166113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1536 + ... + 2586.

2^2166111 is an apocalyptic number.

2166111 is a deficient number, since it is larger than the sum of its proper divisors (979369).

2166111 is a wasteful number, since it uses less digits than its factorization.

2166111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1283 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 2166111 is about 1471.7713817030. The cubic root of 2166111 is about 129.3878717152.

It can be divided in two parts, 216611 and 1, that added together give a palindrome (216612).

The spelling of 2166111 in words is "two million, one hundred sixty-six thousand, one hundred eleven".