1002000999 has 4 divisors (see below), whose sum is σ = 1336001336. Its totient is φ = 668000664.

The previous prime is 1002000997. The next prime is 1002001057. The reversal of 1002000999 is 9990002001.

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

It is not a de Polignac number, because 1002000999 - 2¹ = 1002000997 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 (1002000991) 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, 167000164 + ... + 167000169.

It is an arithmetic number, because the mean of its divisors is an integer number (334000334).

Almost surely, 2^1002000999 is an apocalyptic number.

1002000999 is a deficient number, since it is larger than the sum of its proper divisors (334000337).

1002000999 is an equidigital number, since it uses as much as digits as its factorization.

1002000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334000336.

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

The square root of 1002000999 is about 31654.3993624899. The cubic root of 1002000999 is about 1000.6665552720. Note that the first 3 decimals are identical.

The spelling of 1002000999 in words is "one billion, two million, nine hundred ninety-nine", and thus it is an aban number.