2065681 has 4 divisors (see below), whose sum is σ = 2094052. Its totient is φ = 2037312.

The previous prime is 2065669. The next prime is 2065711. The reversal of 2065681 is 1865602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1865602 = 2 ⋅932801.

It can be written as a sum of positive squares in 2 ways, for example, as 625681 + 1440000 = 791^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 2065681 - 2⁹ = 2065169 is a prime.

It is a super-2 number, since 2×2065681² = 8534075987522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2065181) 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, 14076 + ... + 14221.

It is an arithmetic number, because the mean of its divisors is an integer number (523513).

2^2065681 is an apocalyptic number.

It is an amenable number.

2065681 is a deficient number, since it is larger than the sum of its proper divisors (28371).

2065681 is an equidigital number, since it uses as much as digits as its factorization.

2065681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28370.

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

The square root of 2065681 is about 1437.2477169924. The cubic root of 2065681 is about 127.3564911023.

The spelling of 2065681 in words is "two million, sixty-five thousand, six hundred eighty-one".