8999999999 has 8 divisors (see below), whose sum is σ = 9077004672. Its totient is φ = 8923224600.

The previous prime is 8999999993. The next prime is 9000000001. The reversal of 8999999999 is 9999999998.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8999999999 is a prime.

It is a Duffinian number.

8999999999 is a modest number, since divided by 99999 gives 89999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8999999993) by changing a digit.

Being equal to 9×10⁹-1, it is a generalized Woodall number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21992 + ... + 135954.

It is an arithmetic number, because the mean of its divisors is an integer number (1134625584).

Almost surely, 2^8999999999 is an apocalyptic number.

8999999999 is a deficient number, since it is larger than the sum of its proper divisors (77004673).

8999999999 is a wasteful number, since it uses less digits than its factorization.

8999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114637.

The product of its digits is 3099363912, while the sum is 89.

The square root of 8999999999 is about 94868.3297997809. The cubic root of 8999999999 is about 2080.0838229749.

Subtracting 8999999999 from its reverse (9999999998), we obtain a palindrome (999999999).

The spelling of 8999999999 in words is "eight billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".