2000891 has 4 divisors (see below), whose sum is σ = 2018712. Its totient is φ = 1983072.

The previous prime is 2000863. The next prime is 2000903. The reversal of 2000891 is 1980002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1980002 = 2 ⋅990001.

It is a cyclic number.

It is not a de Polignac number, because 2000891 - 2¹⁰ = 1999867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2000291) 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, 8741 + ... + 8966.

It is an arithmetic number, because the mean of its divisors is an integer number (504678).

2^2000891 is an apocalyptic number.

2000891 is a deficient number, since it is larger than the sum of its proper divisors (17821).

2000891 is a wasteful number, since it uses less digits than its factorization.

2000891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17820.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2000891 is about 1414.5285433670. The cubic root of 2000891 is about 126.0108120394.

Adding to 2000891 its reverse (1980002), we get a palindrome (3980893).

The spelling of 2000891 in words is "two million, eight hundred ninety-one", and thus it is an aban number.