3128128397 has 2 divisors, whose sum is σ = 3128128398. Its totient is φ = 3128128396.

The previous prime is 3128128369. The next prime is 3128128411. The reversal of 3128128397 is 7938218213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2918052361 + 210076036 = 54019^2 + 14494^2 .

It is an emirp because it is prime and its reverse (7938218213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3128128397 - 2²⁰ = 3127079821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3128128307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564064198 + 1564064199.

It is an arithmetic number, because the mean of its divisors is an integer number (1564064199).

Almost surely, 2^3128128397 is an apocalyptic number.

It is an amenable number.

3128128397 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128128397 is an equidigital number, since it uses as much as digits as its factorization.

3128128397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 3128128397 is about 55929.6736714957. The cubic root of 3128128397 is about 1462.4965724419.

The spelling of 3128128397 in words is "three billion, one hundred twenty-eight million, one hundred twenty-eight thousand, three hundred ninety-seven".