8684991861 has 16 divisors (see below), whose sum is σ = 14252294784. Its totient is φ = 4581094464.

The previous prime is 8684991851. The next prime is 8684991893. The reversal of 8684991861 is 1681994868.

8684991861 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 8684991861 - 2¹⁰ = 8684990837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8684991795 and 8684991804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8684991851) 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, 15906306 + ... + 15906851.

It is an arithmetic number, because the mean of its divisors is an integer number (890768424).

Almost surely, 2^8684991861 is an apocalyptic number.

It is an amenable number.

8684991861 is a deficient number, since it is larger than the sum of its proper divisors (5567302923).

8684991861 is a wasteful number, since it uses less digits than its factorization.

8684991861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31813180.

The product of its digits is 5971968, while the sum is 60.

The square root of 8684991861 is about 93193.3037347641. The cubic root of 8684991861 is about 2055.5267768250.

The spelling of 8684991861 in words is "eight billion, six hundred eighty-four million, nine hundred ninety-one thousand, eight hundred sixty-one".