3647002561 has 4 divisors (see below), whose sum is σ = 3772761300. Its totient is φ = 3521243824.

The previous prime is 3647002549. The next prime is 3647002589. The reversal of 3647002561 is 1652007463.

It is a happy number.

3647002561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 642318336 + 3004684225 = 25344^2 + 54815^2 .

It is a cyclic number.

It is not a de Polignac number, because 3647002561 - 2⁹ = 3647002049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3647062561) 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, 62879326 + ... + 62879383.

It is an arithmetic number, because the mean of its divisors is an integer number (943190325).

Almost surely, 2^3647002561 is an apocalyptic number.

It is an amenable number.

3647002561 is a deficient number, since it is larger than the sum of its proper divisors (125758739).

3647002561 is a wasteful number, since it uses less digits than its factorization.

3647002561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125758738.

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

The square root of 3647002561 is about 60390.4177912357. The cubic root of 3647002561 is about 1539.2601383650.

The spelling of 3647002561 in words is "three billion, six hundred forty-seven million, two thousand, five hundred sixty-one".