9643561 has 4 divisors (see below), whose sum is σ = 9651652. Its totient is φ = 9635472.

The previous prime is 9643559. The next prime is 9643577. The reversal of 9643561 is 1653469.

9643561 is digitally balanced in base 3, 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4648336 + 4995225 = 2156^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 9643561 - 2¹ = 9643559 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (9643531) 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, 1866 + ... + 4771.

It is an arithmetic number, because the mean of its divisors is an integer number (2412913).

Almost surely, 2^9643561 is an apocalyptic number.

It is an amenable number.

9643561 is a deficient number, since it is larger than the sum of its proper divisors (8091).

9643561 is a wasteful number, since it uses less digits than its factorization.

9643561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8090.

The product of its digits is 19440, while the sum is 34.

The square root of 9643561 is about 3105.4083467396. The cubic root of 9643561 is about 212.8526904335.

The spelling of 9643561 in words is "nine million, six hundred forty-three thousand, five hundred sixty-one".