6839991273989 has 4 divisors (see below), whose sum is σ = 6843416409324. Its totient is φ = 6836566138656.

The previous prime is 6839991273967. The next prime is 6839991273991. The reversal of 6839991273989 is 9893721999386.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3729371220964 + 3110620053025 = 1931158^2 + 1763695^2 .

It is a cyclic number.

It is not a de Polignac number, because 6839991273989 - 2³⁶ = 6771271797253 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 (6839991273949) 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, 1712564672 + ... + 1712568665.

It is an arithmetic number, because the mean of its divisors is an integer number (1710854102331).

Almost surely, 2^{6839991273989} is an apocalyptic number.

It is an amenable number.

6839991273989 is a deficient number, since it is larger than the sum of its proper divisors (3425135335).

6839991273989 is a wasteful number, since it uses less digits than its factorization.

6839991273989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425135334.

The product of its digits is 2857026816, while the sum is 83.

The spelling of 6839991273989 in words is "six trillion, eight hundred thirty-nine billion, nine hundred ninety-one million, two hundred seventy-three thousand, nine hundred eighty-nine".