989649722839 has 2 divisors, whose sum is σ = 989649722840. Its totient is φ = 989649722838.

The previous prime is 989649722827. The next prime is 989649722891. The reversal of 989649722839 is 938227946989.

It is a weak prime.

It is an emirp because it is prime and its reverse (938227946989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989649722839 - 2²⁵ = 989616168407 is a prime.

It is a super-3 number, since 3×989649722839³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989649722339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494824861419 + 494824861420.

It is an arithmetic number, because the mean of its divisors is an integer number (494824861420).

Almost surely, 2^989649722839 is an apocalyptic number.

989649722839 is a deficient number, since it is larger than the sum of its proper divisors (1).

989649722839 is an equidigital number, since it uses as much as digits as its factorization.

989649722839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846526464, while the sum is 76.

The spelling of 989649722839 in words is "nine hundred eighty-nine billion, six hundred forty-nine million, seven hundred twenty-two thousand, eight hundred thirty-nine".