128860009 has 2 divisors, whose sum is σ = 128860010. Its totient is φ = 128860008.

The previous prime is 128859989. The next prime is 128860019. The reversal of 128860009 is 900068821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76947984 + 51912025 = 8772^2 + 7205^2 .

It is a cyclic number.

It is not a de Polignac number, because 128860009 - 2¹¹ = 128857961 is a prime.

It is not a weakly prime, because it can be changed into another prime (128860019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64430004 + 64430005.

It is an arithmetic number, because the mean of its divisors is an integer number (64430005).

Almost surely, 2^128860009 is an apocalyptic number.

It is an amenable number.

128860009 is a deficient number, since it is larger than the sum of its proper divisors (1).

128860009 is an equidigital number, since it uses as much as digits as its factorization.

128860009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 128860009 is about 11351.6522585921. The cubic root of 128860009 is about 505.0945926129.

The spelling of 128860009 in words is "one hundred twenty-eight million, eight hundred sixty thousand, nine".