2111887 has 4 divisors (see below), whose sum is σ = 2123136. Its totient is φ = 2100640.

The previous prime is 2111873. The next prime is 2111897. The reversal of 2111887 is 7881112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111887 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 (2111897) 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, 5338 + ... + 5719.

It is an arithmetic number, because the mean of its divisors is an integer number (530784).

2^2111887 is an apocalyptic number.

2111887 is a deficient number, since it is larger than the sum of its proper divisors (11249).

2111887 is a wasteful number, since it uses less digits than its factorization.

2111887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11248.

The product of its digits is 896, while the sum is 28.

The square root of 2111887 is about 1453.2332916638. The cubic root of 2111887 is about 128.2990849559.

Adding to 2111887 its reverse (7881112), we get a palindrome (9992999).

The spelling of 2111887 in words is "two million, one hundred eleven thousand, eight hundred eighty-seven".