19191019191 has 16 divisors (see below), whose sum is σ = 25848022368. Its totient is φ = 12664080000.

The previous prime is 19191019189. The next prime is 19191019201.

19191019191 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19191019191 - 2¹ = 19191019189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19191019291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1933341 + ... + 1943241.

It is an arithmetic number, because the mean of its divisors is an integer number (1615501398).

Almost surely, 2^19191019191 is an apocalyptic number.

19191019191 is a deficient number, since it is larger than the sum of its proper divisors (6657003177).

19191019191 is a wasteful number, since it uses less digits than its factorization.

19191019191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16402.

The product of its (nonzero) digits is 6561, while the sum is 42.

The spelling of 19191019191 in words is "nineteen billion, one hundred ninety-one million, nineteen thousand, one hundred ninety-one".