19901009911 has 8 divisors (see below), whose sum is σ = 20035424864. Its totient is φ = 19766864160.

The previous prime is 19901009903. The next prime is 19901009977. The reversal of 19901009911 is 11990010991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19901009911 - 2³ = 19901009903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19901009981) 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 7 ways as a sum of consecutive naturals, for example, 82165 + ... + 215761.

It is an arithmetic number, because the mean of its divisors is an integer number (2504428108).

Almost surely, 2^19901009911 is an apocalyptic number.

19901009911 is a deficient number, since it is larger than the sum of its proper divisors (134414953).

19901009911 is a wasteful number, since it uses less digits than its factorization.

19901009911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134601.

The product of its (nonzero) digits is 6561, while the sum is 40.

The spelling of 19901009911 in words is "nineteen billion, nine hundred one million, nine thousand, nine hundred eleven".