19009999191 has 16 divisors (see below), whose sum is σ = 25965068288. Its totient is φ = 12367404000.

The previous prime is 19009999171. The next prime is 19009999193. The reversal of 19009999191 is 19199990091.

It is not a de Polignac number, because 19009999191 - 2¹⁹ = 19009474903 is a prime.

It is a super-2 number, since 2×19009999191² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19009999193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385735 + ... + 432216.

It is an arithmetic number, because the mean of its divisors is an integer number (1622816768).

Almost surely, 2^19009999191 is an apocalyptic number.

19009999191 is a deficient number, since it is larger than the sum of its proper divisors (6955069097).

19009999191 is a wasteful number, since it uses less digits than its factorization.

19009999191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818142.

The product of its (nonzero) digits is 531441, while the sum is 57.

The spelling of 19009999191 in words is "nineteen billion, nine million, nine hundred ninety-nine thousand, one hundred ninety-one".