1000000999001 has 16 divisors (see below), whose sum is σ = 1037721404160. Its totient is φ = 962501191680.

The previous prime is 1000000998979. The next prime is 1000000999007. The reversal of 1000000999001 is 1009990000001.

1000000999001 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 1000000999001 - 2¹⁰ = 1000000997977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000000999007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11910896 + ... + 11994558.

It is an arithmetic number, because the mean of its divisors is an integer number (64857587760).

Almost surely, 2^{1000000999001} is an apocalyptic number.

It is an amenable number.

1000000999001 is a deficient number, since it is larger than the sum of its proper divisors (37720405159).

1000000999001 is an equidigital number, since it uses as much as digits as its factorization.

1000000999001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84976.

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

Adding to 1000000999001 its reverse (1009990000001), we get a palindrome (2009990999002).

The spelling of 1000000999001 in words is "one trillion, nine hundred ninety-nine thousand, one".