9764972561 has 4 divisors (see below), whose sum is σ = 9765171312. Its totient is φ = 9764773812.

The previous prime is 9764972557. The next prime is 9764972563. The reversal of 9764972561 is 1652794679.

9764972561 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9764972561 - 2² = 9764972557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9764972497 and 9764972506.

It is not an unprimeable number, because it can be changed into a prime (9764972563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33926 + ... + 143808.

It is an arithmetic number, because the mean of its divisors is an integer number (2441292828).

Almost surely, 2^9764972561 is an apocalyptic number.

It is an amenable number.

9764972561 is a deficient number, since it is larger than the sum of its proper divisors (198751).

9764972561 is a wasteful number, since it uses less digits than its factorization.

9764972561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198750.

The product of its digits is 5715360, while the sum is 56.

The square root of 9764972561 is about 98817.8757158845. The cubic root of 9764972561 is about 2137.4223310059.

The spelling of 9764972561 in words is "nine billion, seven hundred sixty-four million, nine hundred seventy-two thousand, five hundred sixty-one".