20191009100009 has 16 divisors (see below), whose sum is σ = 22824102174720. Its totient is φ = 17701647359760.

The previous prime is 20191009099927. The next prime is 20191009100011. The reversal of 20191009100009 is 90000190019102.

It is a cyclic number.

It is not a de Polignac number, because 20191009100009 - 2³² = 20186714132713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20191009100609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270134297 + ... + 270209030.

It is an arithmetic number, because the mean of its divisors is an integer number (1426506385920).

Almost surely, 2^{20191009100009} is an apocalyptic number.

It is an amenable number.

20191009100009 is a deficient number, since it is larger than the sum of its proper divisors (2633093074711).

20191009100009 is a wasteful number, since it uses less digits than its factorization.

20191009100009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540343460.

The product of its (nonzero) digits is 1458, while the sum is 32.

The spelling of 20191009100009 in words is "twenty trillion, one hundred ninety-one billion, nine million, one hundred thousand, nine".