1001001011209 has 4 divisors (see below), whose sum is σ = 1003574278980. Its totient is φ = 998427743440.

The previous prime is 1001001011137. The next prime is 1001001011239. The reversal of 1001001011209 is 9021101001001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 261524846025 + 739476165184 = 511395^2 + 859928^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001001011209 - 2⁹ = 1001001010697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001001011192 and 1001001011201.

It is not an unprimeable number, because it can be changed into a prime (1001001011239) 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, 1286633302 + ... + 1286634079.

It is an arithmetic number, because the mean of its divisors is an integer number (250893569745).

Almost surely, 2^{1001001011209} is an apocalyptic number.

It is an amenable number.

1001001011209 is a deficient number, since it is larger than the sum of its proper divisors (2573267771).

1001001011209 is an equidigital number, since it uses as much as digits as its factorization.

1001001011209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573267770.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 1001001011209 in words is "one trillion, one billion, one million, eleven thousand, two hundred nine".