2111871 has 4 divisors (see below), whose sum is σ = 2815832. Its totient is φ = 1407912.

The previous prime is 2111861. The next prime is 2111873. The reversal of 2111871 is 1781112.

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

It is not a de Polignac number, because 2111871 - 2⁵ = 2111839 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111873) 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, 351976 + ... + 351981.

It is an arithmetic number, because the mean of its divisors is an integer number (703958).

2^2111871 is an apocalyptic number.

2111871 is a deficient number, since it is larger than the sum of its proper divisors (703961).

2111871 is an equidigital number, since it uses as much as digits as its factorization.

2111871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703960.

The product of its digits is 112, while the sum is 21.

The square root of 2111871 is about 1453.2277866873. The cubic root of 2111871 is about 128.2987609501.

Adding to 2111871 its reverse (1781112), we get a palindrome (3892983).

The spelling of 2111871 in words is "two million, one hundred eleven thousand, eight hundred seventy-one".