2891091 has 16 divisors (see below), whose sum is σ = 4548608. Its totient is φ = 1598400.

The previous prime is 2891087. The next prime is 2891093. The reversal of 2891091 is 1901982.

2891091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2891091 - 2² = 2891087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2891093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1570 + ... + 2871.

It is an arithmetic number, because the mean of its divisors is an integer number (284288).

2^2891091 is an apocalyptic number.

2891091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2891091 is a deficient number, since it is larger than the sum of its proper divisors (1657517).

2891091 is a wasteful number, since it uses less digits than its factorization.

2891091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482.

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

The square root of 2891091 is about 1700.3208520747. The cubic root of 2891091 is about 142.4581348238.

It can be divided in two parts, 28 and 91091, that added together give a palindrome (91119).

The spelling of 2891091 in words is "two million, eight hundred ninety-one thousand, ninety-one".