2813891 has 4 divisors (see below), whose sum is σ = 2979432. Its totient is φ = 2648352.

The previous prime is 2813879. The next prime is 2813897. The reversal of 2813891 is 1983182.

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 2813891 - 2⁶ = 2813827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2813897) 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, 82745 + ... + 82778.

It is an arithmetic number, because the mean of its divisors is an integer number (744858).

2^2813891 is an apocalyptic number.

2813891 is a deficient number, since it is larger than the sum of its proper divisors (165541).

2813891 is a wasteful number, since it uses less digits than its factorization.

2813891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165540.

The product of its digits is 3456, while the sum is 32.

The square root of 2813891 is about 1677.4656479344. The cubic root of 2813891 is about 141.1786712722.

The spelling of 2813891 in words is "two million, eight hundred thirteen thousand, eight hundred ninety-one".