128587139 has 2 divisors, whose sum is σ = 128587140. Its totient is φ = 128587138.

The previous prime is 128587127. The next prime is 128587223. The reversal of 128587139 is 931785821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128587139 - 2¹² = 128583043 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128587139.

It is not a weakly prime, because it can be changed into another prime (128580139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64293569 + 64293570.

It is an arithmetic number, because the mean of its divisors is an integer number (64293570).

Almost surely, 2^128587139 is an apocalyptic number.

128587139 is a deficient number, since it is larger than the sum of its proper divisors (1).

128587139 is an equidigital number, since it uses as much as digits as its factorization.

128587139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 44.

The square root of 128587139 is about 11339.6269338987. The cubic root of 128587139 is about 504.7378163926.

The spelling of 128587139 in words is "one hundred twenty-eight million, five hundred eighty-seven thousand, one hundred thirty-nine".