19009190911 has 4 divisors (see below), whose sum is σ = 19197400824. Its totient is φ = 18820981000.

The previous prime is 19009190899. The next prime is 19009190933. The reversal of 19009190911 is 11909190091.

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

It is a cyclic number.

It is not a de Polignac number, because 19009190911 - 2¹⁹ = 19008666623 is a prime.

It is a super-2 number, since 2×19009190911² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19009190971) 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, 94104805 + ... + 94105006.

It is an arithmetic number, because the mean of its divisors is an integer number (4799350206).

Almost surely, 2^19009190911 is an apocalyptic number.

19009190911 is a deficient number, since it is larger than the sum of its proper divisors (188209913).

19009190911 is a wasteful number, since it uses less digits than its factorization.

19009190911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188209912.

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

The spelling of 19009190911 in words is "nineteen billion, nine million, one hundred ninety thousand, nine hundred eleven".