128829978397 has 2 divisors, whose sum is σ = 128829978398. Its totient is φ = 128829978396.

The previous prime is 128829978349. The next prime is 128829978443. The reversal of 128829978397 is 793879928821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119471157316 + 9358821081 = 345646^2 + 96741^2 .

It is a cyclic number.

It is not a de Polignac number, because 128829978397 - 2¹⁹ = 128829454109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128829978307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64414989198 + 64414989199.

It is an arithmetic number, because the mean of its divisors is an integer number (64414989199).

Almost surely, 2^128829978397 is an apocalyptic number.

It is an amenable number.

128829978397 is a deficient number, since it is larger than the sum of its proper divisors (1).

128829978397 is an equidigital number, since it uses as much as digits as its factorization.

128829978397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 73.

The spelling of 128829978397 in words is "one hundred twenty-eight billion, eight hundred twenty-nine million, nine hundred seventy-eight thousand, three hundred ninety-seven".