999981000089 has 4 divisors (see below), whose sum is σ = 1016374131300. Its totient is φ = 983587868880.

The previous prime is 999981000059. The next prime is 999981000103. The reversal of 999981000089 is 980000189999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 530595696400 + 469385303689 = 728420^2 + 685117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999981000089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999980999995 and 999981000040.

It is not an unprimeable number, because it can be changed into a prime (999981000059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8196565514 + ... + 8196565635.

It is an arithmetic number, because the mean of its divisors is an integer number (254093532825).

Almost surely, 2^999981000089 is an apocalyptic number.

It is an amenable number.

999981000089 is a deficient number, since it is larger than the sum of its proper divisors (16393131211).

999981000089 is a wasteful number, since it uses less digits than its factorization.

999981000089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16393131210.

The product of its (nonzero) digits is 3779136, while the sum is 62.

The spelling of 999981000089 in words is "nine hundred ninety-nine billion, nine hundred eighty-one million, eighty-nine", and thus it is an aban number.