1000999999999 has 4 divisors (see below), whose sum is σ = 1001121533064. Its totient is φ = 1000878466936.

The previous prime is 1000999999943. The next prime is 1001000000017. The reversal of 1000999999999 is 9999999990001.

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

It is a cyclic number.

It is not a de Polignac number, because 1000999999999 - 2⁷ = 1000999999871 is a prime.

It is a Duffinian number.

1000999999999 is a modest number, since divided by 9999999 gives 100099 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000999999799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60754177 + ... + 60770650.

It is an arithmetic number, because the mean of its divisors is an integer number (250280383266).

Almost surely, 2^{1000999999999} is an apocalyptic number.

1000999999999 is a deficient number, since it is larger than the sum of its proper divisors (121533065).

1000999999999 is an equidigital number, since it uses as much as digits as its factorization.

1000999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121533064.

The product of its (nonzero) digits is 387420489, while the sum is 82.

It can be divided in two parts, 10009999 and 99999, that multiplied together give a palindrome (1000989890001).

The spelling of 1000999999999 in words is "one trillion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".