1001000009 has 4 divisors (see below), whose sum is σ = 1053684240. Its totient is φ = 948315780.

The previous prime is 1000999949. The next prime is 1001000027. The reversal of 1001000009 is 9000001001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001000009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001000809) 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, 26342087 + ... + 26342124.

It is an arithmetic number, because the mean of its divisors is an integer number (263421060).

Almost surely, 2^1001000009 is an apocalyptic number.

1001000009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1001000009 is a deficient number, since it is larger than the sum of its proper divisors (52684231).

1001000009 is an equidigital number, since it uses as much as digits as its factorization.

1001000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52684230.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 1001000009 is about 31638.5841813441. The cubic root of 1001000009 is about 1000.3332252819. Note that the first 3 decimals are identical.

The spelling of 1001000009 in words is "one billion, one million, nine", and thus it is an aban number and an uban number.