19961289171 has 6 divisors (see below), whose sum is σ = 28832973260. Its totient is φ = 13307526108.

The previous prime is 19961289149. The next prime is 19961289203. The reversal of 19961289171 is 17198216991.

19961289171 is a `hidden beast` number, since 1 + 9 + 9 + 612 + 8 + 9 + 17 + 1 = 666.

It is not a de Polignac number, because 19961289171 - 2¹⁷ = 19961158099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19961289121) 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 5 ways as a sum of consecutive naturals, for example, 1108960501 + ... + 1108960518.

Almost surely, 2^19961289171 is an apocalyptic number.

19961289171 is a deficient number, since it is larger than the sum of its proper divisors (8871684089).

19961289171 is a wasteful number, since it uses less digits than its factorization.

19961289171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217921025 (or 2217921022 counting only the distinct ones).

The product of its digits is 489888, while the sum is 54.

The spelling of 19961289171 in words is "nineteen billion, nine hundred sixty-one million, two hundred eighty-nine thousand, one hundred seventy-one".