191940078489 has 8 divisors (see below), whose sum is σ = 262162058592. Its totient is φ = 124839075360.

The previous prime is 191940078487. The next prime is 191940078511. The reversal of 191940078489 is 984870049191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191940078489 - 2¹ = 191940078487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191940078487) 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 7 ways as a sum of consecutive naturals, for example, 780244099 + ... + 780244344.

It is an arithmetic number, because the mean of its divisors is an integer number (32770257324).

Almost surely, 2^191940078489 is an apocalyptic number.

It is an amenable number.

191940078489 is a deficient number, since it is larger than the sum of its proper divisors (70221980103).

191940078489 is a wasteful number, since it uses less digits than its factorization.

191940078489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560488487.

The product of its (nonzero) digits is 5225472, while the sum is 60.

The spelling of 191940078489 in words is "one hundred ninety-one billion, nine hundred forty million, seventy-eight thousand, four hundred eighty-nine".