1001000999999 has 128 divisors (see below), whose sum is σ = 1399830405120. Its totient is φ = 690782515200.

The previous prime is 1001000999987. The next prime is 1001001000019. The reversal of 1001000999999 is 9999990001001.

1001000999999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1001000999999 - 2²⁰ = 1000999951423 is a prime.

1001000999999 is a modest number, since divided by 999999 gives 1001 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001000999959) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1632954017 + ... + 1632954629.

It is an arithmetic number, because the mean of its divisors is an integer number (10936175040).

Almost surely, 2^{1001000999999} is an apocalyptic number.

1001000999999 is a deficient number, since it is larger than the sum of its proper divisors (398829405121).

1001000999999 is a wasteful number, since it uses less digits than its factorization.

1001000999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321.

The product of its (nonzero) digits is 531441, while the sum is 56.

The spelling of 1001000999999 in words is "one trillion, one billion, nine hundred ninety-nine thousand, nine hundred ninety-nine".