9641561 has 4 divisors (see below), whose sum is σ = 9737124. Its totient is φ = 9546000.

The previous prime is 9641549. The next prime is 9641563. The reversal of 9641561 is 1651469.

9641561 is digitally balanced in base 2 and base 3, because in such bases 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 8094025 + 1547536 = 2845^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 9641561 - 2¹⁸ = 9379417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9641563) 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, 47630 + ... + 47831.

It is an arithmetic number, because the mean of its divisors is an integer number (2434281).

Almost surely, 2^9641561 is an apocalyptic number.

It is an amenable number.

9641561 is a deficient number, since it is larger than the sum of its proper divisors (95563).

9641561 is a wasteful number, since it uses less digits than its factorization.

9641561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95562.

The product of its digits is 6480, while the sum is 32.

The square root of 9641561 is about 3105.0863111997. The cubic root of 9641561 is about 212.8379747486.

The spelling of 9641561 in words is "nine million, six hundred forty-one thousand, five hundred sixty-one".