191427798789 has 24 divisors (see below), whose sum is σ = 277443409152. Its totient is φ = 127186899840.

The previous prime is 191427798781. The next prime is 191427798827. The reversal of 191427798789 is 987897724191.

191427798789 is a `hidden beast` number, since 191 + 4 + 277 + 98 + 7 + 89 = 666.

191427798789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191427798789 - 2³ = 191427798781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191427798781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3664524 + ... + 3716394.

It is an arithmetic number, because the mean of its divisors is an integer number (11560142048).

Almost surely, 2^191427798789 is an apocalyptic number.

It is an amenable number.

191427798789 is a deficient number, since it is larger than the sum of its proper divisors (86015610363).

191427798789 is a wasteful number, since it uses less digits than its factorization.

191427798789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53257 (or 53254 counting only the distinct ones).

The product of its digits is 128024064, while the sum is 72.

The spelling of 191427798789 in words is "one hundred ninety-one billion, four hundred twenty-seven million, seven hundred ninety-eight thousand, seven hundred eighty-nine".