9861221689 has 8 divisors (see below), whose sum is σ = 10893870720. Its totient is φ = 8851268400.

The previous prime is 9861221681. The next prime is 9861221729.

9861221689 is nontrivially palindromic in base 10.

9861221689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9861221689 - 2³ = 9861221681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9861221681) 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 7 ways as a sum of consecutive naturals, for example, 5673022 + ... + 5674759.

It is an arithmetic number, because the mean of its divisors is an integer number (1361733840).

Almost surely, 2^9861221689 is an apocalyptic number.

It is an amenable number.

9861221689 is a deficient number, since it is larger than the sum of its proper divisors (1032649031).

9861221689 is a wasteful number, since it uses less digits than its factorization.

9861221689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11347871.

The product of its digits is 746496, while the sum is 52.

The square root of 9861221689 is about 99303.6841662987. The cubic root of 9861221689 is about 2144.4219341613.

The spelling of 9861221689 in words is "nine billion, eight hundred sixty-one million, two hundred twenty-one thousand, six hundred eighty-nine".