2019891 has 4 divisors (see below), whose sum is σ = 2693192. Its totient is φ = 1346592.

The previous prime is 2019881. The next prime is 2019907. The reversal of 2019891 is 1989102.

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

It is not a de Polignac number, because 2019891 - 2⁵ = 2019859 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2019811) 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, 336646 + ... + 336651.

It is an arithmetic number, because the mean of its divisors is an integer number (673298).

2^2019891 is an apocalyptic number.

2019891 is a deficient number, since it is larger than the sum of its proper divisors (673301).

2019891 is an equidigital number, since it uses as much as digits as its factorization.

2019891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673300.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2019891 is about 1421.2286937717. The cubic root of 2019891 is about 126.4084127219.

The spelling of 2019891 in words is "two million, nineteen thousand, eight hundred ninety-one".