2591891 has 2 divisors, whose sum is σ = 2591892. Its totient is φ = 2591890.

The previous prime is 2591857. The next prime is 2591899. The reversal of 2591891 is 1981952.

2591891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2591891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2591899) 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 as a sum of consecutive naturals, namely, 1295945 + 1295946.

It is an arithmetic number, because the mean of its divisors is an integer number (1295946).

2^2591891 is an apocalyptic number.

2591891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591891 is an equidigital number, since it uses as much as digits as its factorization.

2591891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 35.

The square root of 2591891 is about 1609.9350918593. The cubic root of 2591891 is about 137.3637835570.

The spelling of 2591891 in words is "two million, five hundred ninety-one thousand, eight hundred ninety-one".