128081509 has 2 divisors, whose sum is σ = 128081510. Its totient is φ = 128081508.

The previous prime is 128081497. The next prime is 128081521. The reversal of 128081509 is 905180821.

It is a balanced prime because it is at equal distance from previous prime (128081497) and next prime (128081521).

It can be written as a sum of positive squares in only one way, i.e., 122544900 + 5536609 = 11070^2 + 2353^2 .

It is a cyclic number.

It is not a de Polignac number, because 128081509 - 2¹⁷ = 127950437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128081539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64040754 + 64040755.

It is an arithmetic number, because the mean of its divisors is an integer number (64040755).

Almost surely, 2^128081509 is an apocalyptic number.

It is an amenable number.

128081509 is a deficient number, since it is larger than the sum of its proper divisors (1).

128081509 is an equidigital number, since it uses as much as digits as its factorization.

128081509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 128081509 is about 11317.3101486175. The cubic root of 128081509 is about 504.0753711186.

The spelling of 128081509 in words is "one hundred twenty-eight million, eighty-one thousand, five hundred nine".