19191347889 has 48 divisors (see below), whose sum is σ = 31744440000. Its totient is φ = 10246957056.

The previous prime is 19191347887. The next prime is 19191347963. The reversal of 19191347889 is 98874319191.

It is not a de Polignac number, because 19191347889 - 2¹ = 19191347887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19191347887) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 319737 + ... + 374985.

It is an arithmetic number, because the mean of its divisors is an integer number (661342500).

Almost surely, 2^19191347889 is an apocalyptic number.

It is an amenable number.

19191347889 is a deficient number, since it is larger than the sum of its proper divisors (12553092111).

19191347889 is a wasteful number, since it uses less digits than its factorization.

19191347889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55422 (or 55415 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 60.

The spelling of 19191347889 in words is "nineteen billion, one hundred ninety-one million, three hundred forty-seven thousand, eight hundred eighty-nine".