2881891 has 4 divisors (see below), whose sum is σ = 3051432. Its totient is φ = 2712352.

The previous prime is 2881889. The next prime is 2881897. The reversal of 2881891 is 1981882.

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 2881891 - 2¹ = 2881889 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2881891.

It is not an unprimeable number, because it can be changed into a prime (2881897) 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, 84745 + ... + 84778.

It is an arithmetic number, because the mean of its divisors is an integer number (762858).

2^2881891 is an apocalyptic number.

2881891 is a deficient number, since it is larger than the sum of its proper divisors (169541).

2881891 is a wasteful number, since it uses less digits than its factorization.

2881891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169540.

The product of its digits is 9216, while the sum is 37.

The square root of 2881891 is about 1697.6133246414. The cubic root of 2881891 is about 142.3068646503.

Subtracting from 2881891 its reverse (1981882), we obtain a palindrome (900009).

The spelling of 2881891 in words is "two million, eight hundred eighty-one thousand, eight hundred ninety-one".