191919191919191 has 16 divisors (see below), whose sum is σ = 210121769664288. Its totient is φ = 173842571481600.

The previous prime is 191919191919181. The next prime is 191919191919227.

191919191919191 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 191919191919191 - 2⁶ = 191919191919127 is a prime.

It is a Duffinian number.

191919191919191 is an undulating number in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191919191919181) 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, 61955555 + ... + 64979451.

It is an arithmetic number, because the mean of its divisors is an integer number (13132610604018).

Almost surely, 2^{191919191919191} is an apocalyptic number.

191919191919191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

191919191919191 is a deficient number, since it is larger than the sum of its proper divisors (18202577745097).

191919191919191 is a wasteful number, since it uses less digits than its factorization.

191919191919191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044722.

The product of its digits is 4782969, while the sum is 71.

The spelling of 191919191919191 in words is "one hundred ninety-one trillion, nine hundred nineteen billion, one hundred ninety-one million, nine hundred nineteen thousand, one hundred ninety-one".