3240706561 has 4 divisors (see below), whose sum is σ = 3240842452. Its totient is φ = 3240570672.

The previous prime is 3240706559. The next prime is 3240706591. The reversal of 3240706561 is 1656070423.

It is a happy number.

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 186486336 + 3054220225 = 13656^2 + 55265^2 .

It is a cyclic number.

It is not a de Polignac number, because 3240706561 - 2¹ = 3240706559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3240706591) 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, 21666 + ... + 83371.

It is an arithmetic number, because the mean of its divisors is an integer number (810210613).

Almost surely, 2^3240706561 is an apocalyptic number.

It is an amenable number.

3240706561 is a deficient number, since it is larger than the sum of its proper divisors (135891).

3240706561 is a wasteful number, since it uses less digits than its factorization.

3240706561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135890.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 3240706561 is about 56927.2040504362. The cubic root of 3240706561 is about 1479.8348003154.

Adding to 3240706561 its reverse (1656070423), we get a palindrome (4896776984).

The spelling of 3240706561 in words is "three billion, two hundred forty million, seven hundred six thousand, five hundred sixty-one".