100000000999 has 4 divisors (see below), whose sum is σ = 100020010000. Its totient is φ = 99979992000.

The previous prime is 100000000951. The next prime is 100000001009. The reversal of 100000000999 is 999000000001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999000000001 = 1949 ⋅512570549.

It is a cyclic number.

It is not a de Polignac number, because 100000000999 - 2⁹ = 100000000487 is a prime.

It is a Duffinian number.

100000000999 is a modest number, since divided by 999 gives 100 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000000699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9997002 + ... + 10006999.

It is an arithmetic number, because the mean of its divisors is an integer number (25005002500).

Almost surely, 2^100000000999 is an apocalyptic number.

100000000999 is a deficient number, since it is larger than the sum of its proper divisors (20009001).

100000000999 is an equidigital number, since it uses as much as digits as its factorization.

100000000999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20009000.

The product of its (nonzero) digits is 729, while the sum is 28.

The spelling of 100000000999 in words is "one hundred billion, nine hundred ninety-nine", and thus it is an aban number.