128849525789 has 2 divisors, whose sum is σ = 128849525790. Its totient is φ = 128849525788.

The previous prime is 128849525771. The next prime is 128849525863. The reversal of 128849525789 is 987525948821.

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., 105758292025 + 23091233764 = 325205^2 + 151958^2 .

It is an emirp because it is prime and its reverse (987525948821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128849525789 - 2¹⁶ = 128849460253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128849525689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64424762894 + 64424762895.

It is an arithmetic number, because the mean of its divisors is an integer number (64424762895).

Almost surely, 2^128849525789 is an apocalyptic number.

It is an amenable number.

128849525789 is a deficient number, since it is larger than the sum of its proper divisors (1).

128849525789 is an equidigital number, since it uses as much as digits as its factorization.

128849525789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116121600, while the sum is 68.

The spelling of 128849525789 in words is "one hundred twenty-eight billion, eight hundred forty-nine million, five hundred twenty-five thousand, seven hundred eighty-nine".