2665891 has 2 divisors, whose sum is σ = 2665892. Its totient is φ = 2665890.

The previous prime is 2665879. The next prime is 2665913. The reversal of 2665891 is 1985662.

2665891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2665891 - 2⁷ = 2665763 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2665891.

It is not a weakly prime, because it can be changed into another prime (2665801) 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, 1332945 + 1332946.

It is an arithmetic number, because the mean of its divisors is an integer number (1332946).

2^2665891 is an apocalyptic number.

2665891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665891 is an equidigital number, since it uses as much as digits as its factorization.

2665891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 2665891 is about 1632.7556461394. The cubic root of 2665891 is about 138.6588081356.

The spelling of 2665891 in words is "two million, six hundred sixty-five thousand, eight hundred ninety-one".