2891789 has 2 divisors, whose sum is σ = 2891790. Its totient is φ = 2891788.

The previous prime is 2891761. The next prime is 2891821. The reversal of 2891789 is 9871982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 917764 = 1405^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891789 - 2¹² = 2887693 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445894 + 1445895.

It is an arithmetic number, because the mean of its divisors is an integer number (1445895).

2^2891789 is an apocalyptic number.

It is an amenable number.

2891789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891789 is an equidigital number, since it uses as much as digits as its factorization.

2891789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 2891789 is about 1700.5260950659. The cubic root of 2891789 is about 142.4695985212.

The spelling of 2891789 in words is "two million, eight hundred ninety-one thousand, seven hundred eighty-nine".