3128717849 has 2 divisors, whose sum is σ = 3128717850. Its totient is φ = 3128717848.

The previous prime is 3128717843. The next prime is 3128717881. The reversal of 3128717849 is 9487178213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3064397449 + 64320400 = 55357^2 + 8020^2 .

It is a cyclic number.

It is not a de Polignac number, because 3128717849 - 2²⁰ = 3127669273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3128717797 and 3128717806.

It is not a weakly prime, because it can be changed into another prime (3128717843) 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 as a sum of consecutive naturals, namely, 1564358924 + 1564358925.

It is an arithmetic number, because the mean of its divisors is an integer number (1564358925).

Almost surely, 2^3128717849 is an apocalyptic number.

It is an amenable number.

3128717849 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128717849 is an equidigital number, since it uses as much as digits as its factorization.

3128717849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 50.

The square root of 3128717849 is about 55934.9430052449. The cubic root of 3128717849 is about 1462.5884290067.

The spelling of 3128717849 in words is "three billion, one hundred twenty-eight million, seven hundred seventeen thousand, eight hundred forty-nine".