2111989 has 4 divisors (see below), whose sum is σ = 2304000. Its totient is φ = 1919980.

The previous prime is 2111971. The next prime is 2112007. The reversal of 2111989 is 9891112.

2111989 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2111971) and next prime (2112007).

It is a cyclic number.

It is not a de Polignac number, because 2111989 - 2⁷ = 2111861 is a prime.

It is a super-2 number, since 2×2111989² = 8920995072242, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹³ + 1 + 1 + 1 + 9² + 8⁷ + 9⁴ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111909) 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, 95989 + ... + 96010.

It is an arithmetic number, because the mean of its divisors is an integer number (576000).

2^2111989 is an apocalyptic number.

It is an amenable number.

2111989 is a deficient number, since it is larger than the sum of its proper divisors (192011).

2111989 is a wasteful number, since it uses less digits than its factorization.

2111989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192010.

The product of its digits is 1296, while the sum is 31.

The square root of 2111989 is about 1453.2683853989. The cubic root of 2111989 is about 128.3011504540.

The spelling of 2111989 in words is "two million, one hundred eleven thousand, nine hundred eighty-nine".