2065891 has 4 divisors (see below), whose sum is σ = 2187432. Its totient is φ = 1944352.

The previous prime is 2065879. The next prime is 2065897. The reversal of 2065891 is 1985602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1985602 = 2 ⋅992801.

It is a cyclic number.

It is not a de Polignac number, because 2065891 - 2⁹ = 2065379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2065897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60745 + ... + 60778.

It is an arithmetic number, because the mean of its divisors is an integer number (546858).

2^2065891 is an apocalyptic number.

2065891 is a deficient number, since it is larger than the sum of its proper divisors (121541).

2065891 is a wasteful number, since it uses less digits than its factorization.

2065891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121540.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2065891 is about 1437.3207714355. The cubic root of 2065891 is about 127.3608067019.

The spelling of 2065891 in words is "two million, sixty-five thousand, eight hundred ninety-one".