1012001002009 has 4 divisors (see below), whose sum is σ = 1012043498704. Its totient is φ = 1011958505316.

The previous prime is 1012001002007. The next prime is 1012001002043. The reversal of 1012001002009 is 9002001002101.

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 1012001002009 - 2¹ = 1012001002007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012001001983 and 1012001002001.

It is not an unprimeable number, because it can be changed into a prime (1012001002007) 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, 21212607 + ... + 21260260.

It is an arithmetic number, because the mean of its divisors is an integer number (253010874676).

Almost surely, 2^{1012001002009} is an apocalyptic number.

It is an amenable number.

1012001002009 is a deficient number, since it is larger than the sum of its proper divisors (42496695).

1012001002009 is an equidigital number, since it uses as much as digits as its factorization.

1012001002009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42496694.

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

The spelling of 1012001002009 in words is "one trillion, twelve billion, one million, two thousand, nine".