9891161643 has 16 divisors (see below), whose sum is σ = 14390804736. Its totient is φ = 5993118240.

The previous prime is 9891161627. The next prime is 9891161677. The reversal of 9891161643 is 3461611989.

It is a happy number.

9891161643 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 9891161643 - 2⁴ = 9891161627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9891161592 and 9891161601.

It is not an unprimeable number, because it can be changed into a prime (9891165643) 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, 101130 + ... + 173232.

It is an arithmetic number, because the mean of its divisors is an integer number (899425296).

Almost surely, 2^9891161643 is an apocalyptic number.

9891161643 is a deficient number, since it is larger than the sum of its proper divisors (4499643093).

9891161643 is a wasteful number, since it uses less digits than its factorization.

9891161643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76274.

The product of its digits is 279936, while the sum is 48.

The square root of 9891161643 is about 99454.3193782955. The cubic root of 9891161643 is about 2146.5899896124.

The spelling of 9891161643 in words is "nine billion, eight hundred ninety-one million, one hundred sixty-one thousand, six hundred forty-three".