839689919489 has 2 divisors, whose sum is σ = 839689919490. Its totient is φ = 839689919488.

The previous prime is 839689919437. The next prime is 839689919527. The reversal of 839689919489 is 984919986938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 459808760464 + 379881159025 = 678092^2 + 616345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-839689919489 is a prime.

It is a super-2 number, since 2×839689919489² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (839689919389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419844959744 + 419844959745.

It is an arithmetic number, because the mean of its divisors is an integer number (419844959745).

Almost surely, 2^839689919489 is an apocalyptic number.

It is an amenable number.

839689919489 is a deficient number, since it is larger than the sum of its proper divisors (1).

839689919489 is an equidigital number, since it uses as much as digits as its factorization.

839689919489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2176782336, while the sum is 83.

The spelling of 839689919489 in words is "eight hundred thirty-nine billion, six hundred eighty-nine million, nine hundred nineteen thousand, four hundred eighty-nine".