3221260565 has 4 divisors (see below), whose sum is σ = 3865512684. Its totient is φ = 2577008448.

The previous prime is 3221260543. The next prime is 3221260621. The reversal of 3221260565 is 5650621223.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1570219876 + 1651040689 = 39626^2 + 40633^2 .

It is a cyclic number.

It is not a de Polignac number, because 3221260565 - 2⁸ = 3221260309 is a prime.

It is a Duffinian number.

It is a Curzon 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, 322126052 + ... + 322126061.

It is an arithmetic number, because the mean of its divisors is an integer number (966378171).

Almost surely, 2^3221260565 is an apocalyptic number.

It is an amenable number.

3221260565 is a deficient number, since it is larger than the sum of its proper divisors (644252119).

3221260565 is an equidigital number, since it uses as much as digits as its factorization.

3221260565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644252118.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 3221260565 is about 56756.1500191829. The cubic root of 3221260565 is about 1476.8689231074.

Adding to 3221260565 its reverse (5650621223), we get a palindrome (8871881788).

The spelling of 3221260565 in words is "three billion, two hundred twenty-one million, two hundred sixty thousand, five hundred sixty-five".