9861772161 has 16 divisors (see below), whose sum is σ = 13774636800. Its totient is φ = 6267451008.

The previous prime is 9861772127. The next prime is 9861772163. The reversal of 9861772161 is 1612771689.

9861772161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9861772161 - 2¹⁹ = 9861247873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9861772161.

It is not an unprimeable number, because it can be changed into a prime (9861772163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710556 + ... + 724301.

It is an arithmetic number, because the mean of its divisors is an integer number (860914800).

Almost surely, 2^9861772161 is an apocalyptic number.

It is an amenable number.

9861772161 is a deficient number, since it is larger than the sum of its proper divisors (3912864639).

9861772161 is a wasteful number, since it uses less digits than its factorization.

9861772161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434968.

The product of its digits is 254016, while the sum is 48.

The square root of 9861772161 is about 99306.4557871239. The cubic root of 9861772161 is about 2144.4618353116.

The spelling of 9861772161 in words is "nine billion, eight hundred sixty-one million, seven hundred seventy-two thousand, one hundred sixty-one".