2011859 has 4 divisors (see below), whose sum is σ = 2018640. Its totient is φ = 2005080.

The previous prime is 2011843. The next prime is 2011861. The reversal of 2011859 is 9581102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9581102 = 2 ⋅4790551.

It is a cyclic number.

It is not a de Polignac number, because 2011859 - 2⁴ = 2011843 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 (2011259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2924 + ... + 3545.

It is an arithmetic number, because the mean of its divisors is an integer number (504660).

2^2011859 is an apocalyptic number.

2011859 is a deficient number, since it is larger than the sum of its proper divisors (6781).

2011859 is an equidigital number, since it uses as much as digits as its factorization.

2011859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 2011859 is about 1418.4001551043. The cubic root of 2011859 is about 126.2406378052.

The spelling of 2011859 in words is "two million, eleven thousand, eight hundred fifty-nine".