2043565 has 4 divisors (see below), whose sum is σ = 2452284. Its totient is φ = 1634848.

The previous prime is 2043541. The next prime is 2043571. The reversal of 2043565 is 5653402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5653402 = 2 ⋅2826701.

It can be written as a sum of positive squares in 2 ways, for example, as 316969 + 1726596 = 563^2 + 1314^2 .

It is a cyclic number.

It is not a de Polignac number, because 2043565 - 2⁹ = 2043053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204352 + ... + 204361.

It is an arithmetic number, because the mean of its divisors is an integer number (613071).

2^2043565 is an apocalyptic number.

It is an amenable number.

2043565 is a deficient number, since it is larger than the sum of its proper divisors (408719).

2043565 is an equidigital number, since it uses as much as digits as its factorization.

2043565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408718.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 2043565 is about 1429.5331405742. The cubic root of 2043565 is about 126.9003496308.

Adding to 2043565 its reverse (5653402), we get a palindrome (7696967).

The spelling of 2043565 in words is "two million, forty-three thousand, five hundred sixty-five".