1001000999 has 16 divisors (see below), whose sum is σ = 1045021824. Its totient is φ = 958120800.

The previous prime is 1001000989. The next prime is 1001001011. The reversal of 1001000999 is 9990001001.

It is a cyclic number.

It is not a de Polignac number, because 1001000999 - 2¹² = 1000996903 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 (1001000929) 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, 466469 + ... + 468609.

It is an arithmetic number, because the mean of its divisors is an integer number (65313864).

Almost surely, 2^1001000999 is an apocalyptic number.

1001000999 is a deficient number, since it is larger than the sum of its proper divisors (44020825).

1001000999 is a wasteful number, since it uses less digits than its factorization.

1001000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398.

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

The square root of 1001000999 is about 31638.5998267939. The cubic root of 1001000999 is about 1000.3335550620. Note that the first 3 decimals are identical.

The spelling of 1001000999 in words is "one billion, one million, nine hundred ninety-nine", and thus it is an aban number.