128791529 has 2 divisors, whose sum is σ = 128791530. Its totient is φ = 128791528.

The previous prime is 128791499. The next prime is 128791543. The reversal of 128791529 is 925197821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68029504 + 60762025 = 8248^2 + 7795^2 .

It is a cyclic number.

It is not a de Polignac number, because 128791529 - 2¹² = 128787433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128791529.

It is not a weakly prime, because it can be changed into another prime (128794529) 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, 64395764 + 64395765.

It is an arithmetic number, because the mean of its divisors is an integer number (64395765).

Almost surely, 2^128791529 is an apocalyptic number.

It is an amenable number.

128791529 is a deficient number, since it is larger than the sum of its proper divisors (1).

128791529 is an equidigital number, since it uses as much as digits as its factorization.

128791529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 128791529 is about 11348.6355567531. The cubic root of 128791529 is about 505.0051027161.

The spelling of 128791529 in words is "one hundred twenty-eight million, seven hundred ninety-one thousand, five hundred twenty-nine".