2111987 has 4 divisors (see below), whose sum is σ = 2122800. Its totient is φ = 2101176.

The previous prime is 2111971. The next prime is 2112007. The reversal of 2111987 is 7891112.

2111987 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 is a cyclic number.

It is not a de Polignac number, because 2111987 - 2⁴ = 2111971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111917) 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 3 ways as a sum of consecutive naturals, for example, 5108 + ... + 5505.

It is an arithmetic number, because the mean of its divisors is an integer number (530700).

2^2111987 is an apocalyptic number.

2111987 is a deficient number, since it is larger than the sum of its proper divisors (10813).

2111987 is a wasteful number, since it uses less digits than its factorization.

2111987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10812.

The product of its digits is 1008, while the sum is 29.

The square root of 2111987 is about 1453.2676972946. The cubic root of 2111987 is about 128.3011099547.

The spelling of 2111987 in words is "two million, one hundred eleven thousand, nine hundred eighty-seven".