1001000000999 has 8 divisors (see below), whose sum is σ = 1011014004000. Its totient is φ = 990988020000.

The previous prime is 1001000000993. The next prime is 1001000001007. The reversal of 1001000000999 is 9990000001001.

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 1001000000999 - 2²⁴ = 1000983223783 is a prime.

It is a super-9 number, since 9×1001000000999⁹ (a number of 109 digits) contains 999999999 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001000000993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499502 + ... + 1500500.

It is an arithmetic number, because the mean of its divisors is an integer number (126376750500).

Almost surely, 2^{1001000000999} is an apocalyptic number.

1001000000999 is a deficient number, since it is larger than the sum of its proper divisors (10014003001).

1001000000999 is a wasteful number, since it uses less digits than its factorization.

1001000000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011001.

The product of its (nonzero) digits is 729, while the sum is 29.

The spelling of 1001000000999 in words is "one trillion, one billion, nine hundred ninety-nine", and thus it is an aban number.