9831610544561 has 24 divisors (see below), whose sum is σ = 11287368866424. Its totient is φ = 8511092029440.

The previous prime is 9831610544557. The next prime is 9831610544599. The reversal of 9831610544561 is 1654450161389.

9831610544561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 2926987192336 + 6904623352225 = 1710844^2 + 2627665^2 .

It is not a de Polignac number, because 9831610544561 - 2² = 9831610544557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9831610544551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3600650 + ... + 5712083.

It is an arithmetic number, because the mean of its divisors is an integer number (470307036101).

Almost surely, 2^{9831610544561} is an apocalyptic number.

It is an amenable number.

9831610544561 is a deficient number, since it is larger than the sum of its proper divisors (1455758321863).

9831610544561 is a wasteful number, since it uses less digits than its factorization.

9831610544561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9313061 (or 9313044 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 9831610544561 in words is "nine trillion, eight hundred thirty-one billion, six hundred ten million, five hundred forty-four thousand, five hundred sixty-one".