1001002012009 has 4 divisors (see below), whose sum is σ = 1001017502800. Its totient is φ = 1000986521220.

The previous prime is 1001002011983. The next prime is 1001002012013. The reversal of 1001002012009 is 9002102001001.

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 1001002012009 - 2¹¹ = 1001002009961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001002011983 and 1001002012001.

It is not an unprimeable number, because it can be changed into a prime (1001002015009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7648059 + ... + 7777840.

It is an arithmetic number, because the mean of its divisors is an integer number (250254375700).

Almost surely, 2^{1001002012009} is an apocalyptic number.

It is an amenable number.

1001002012009 is a deficient number, since it is larger than the sum of its proper divisors (15490791).

1001002012009 is an equidigital number, since it uses as much as digits as its factorization.

1001002012009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15490790.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 1001002012009 in words is "one trillion, one billion, two million, twelve thousand, nine".