2001000999 has 8 divisors (see below), whose sum is σ = 2669344000. Its totient is φ = 1333329336.

The previous prime is 2001000977. The next prime is 2001001003. The reversal of 2001000999 is 9990001002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001000999 - 2¹² = 2000996903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001002999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160837 + ... + 172830.

It is an arithmetic number, because the mean of its divisors is an integer number (333668000).

Almost surely, 2^2001000999 is an apocalyptic number.

2001000999 is a deficient number, since it is larger than the sum of its proper divisors (668343001).

2001000999 is a wasteful number, since it uses less digits than its factorization.

2001000999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335669.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 2001000999 is about 44732.5496590570. The cubic root of 2001000999 is about 1260.1312114554.

It can be divided in two parts, 20010009 and 99, that multiplied together give a palindrome (1980990891).

The spelling of 2001000999 in words is "two billion, one million, nine hundred ninety-nine", and thus it is an aban number.