191980871039 has 4 divisors (see below), whose sum is σ = 200327865456. Its totient is φ = 183633876624.

The previous prime is 191980871009. The next prime is 191980871051. The reversal of 191980871039 is 930178089191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 191980871039 - 2¹² = 191980866943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191980871009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4173497174 + ... + 4173497219.

It is an arithmetic number, because the mean of its divisors is an integer number (50081966364).

Almost surely, 2^191980871039 is an apocalyptic number.

191980871039 is a deficient number, since it is larger than the sum of its proper divisors (8346994417).

191980871039 is an equidigital number, since it uses as much as digits as its factorization.

191980871039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8346994416.

The product of its (nonzero) digits is 979776, while the sum is 56.

The spelling of 191980871039 in words is "one hundred ninety-one billion, nine hundred eighty million, eight hundred seventy-one thousand, thirty-nine".