128829978349 has 2 divisors, whose sum is σ = 128829978350. Its totient is φ = 128829978348.

The previous prime is 128829978341. The next prime is 128829978397. The reversal of 128829978349 is 943879928821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118004616324 + 10825362025 = 343518^2 + 104045^2 .

It is an emirp because it is prime and its reverse (943879928821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128829978349 - 2³ = 128829978341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128829978341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64414989174 + 64414989175.

It is an arithmetic number, because the mean of its divisors is an integer number (64414989175).

Almost surely, 2^128829978349 is an apocalyptic number.

It is an amenable number.

128829978349 is a deficient number, since it is larger than the sum of its proper divisors (1).

128829978349 is an equidigital number, since it uses as much as digits as its factorization.

128829978349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125411328, while the sum is 70.

The spelling of 128829978349 in words is "one hundred twenty-eight billion, eight hundred twenty-nine million, nine hundred seventy-eight thousand, three hundred forty-nine".