1001020009 has 4 divisors (see below), whose sum is σ = 1092021840. Its totient is φ = 910018180.

The previous prime is 1001020003. The next prime is 1001020021. The reversal of 1001020009 is 9000201001.

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 not a de Polignac number, because 1001020009 - 2⁷ = 1001019881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001020003) 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 3 ways as a sum of consecutive naturals, for example, 45500899 + ... + 45500920.

It is an arithmetic number, because the mean of its divisors is an integer number (273005460).

Almost surely, 2^1001020009 is an apocalyptic number.

It is an amenable number.

1001020009 is a deficient number, since it is larger than the sum of its proper divisors (91001831).

1001020009 is an equidigital number, since it uses as much as digits as its factorization.

1001020009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91001830.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1001020009 is about 31638.9002495346. The cubic root of 1001020009 is about 1000.3398874634.

The spelling of 1001020009 in words is "one billion, one million, twenty thousand, nine".