2065861 has 4 divisors (see below), whose sum is σ = 2360992. Its totient is φ = 1770732.

The previous prime is 2065841. The next prime is 2065879. The reversal of 2065861 is 1685602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1685602 = 2 ⋅842801.

It is a cyclic number.

It is not a de Polignac number, because 2065861 - 2⁵ = 2065829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147555 + ... + 147568.

It is an arithmetic number, because the mean of its divisors is an integer number (590248).

2^2065861 is an apocalyptic number.

It is an amenable number.

2065861 is a deficient number, since it is larger than the sum of its proper divisors (295131).

2065861 is an equidigital number, since it uses as much as digits as its factorization.

2065861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295130.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2065861 is about 1437.3103353138. The cubic root of 2065861 is about 127.3601902056.

It can be divided in two parts, 2065 and 861, that added together give a triangular number (2926 = T₇₆).

The spelling of 2065861 in words is "two million, sixty-five thousand, eight hundred sixty-one".