128231659 has 2 divisors, whose sum is σ = 128231660. Its totient is φ = 128231658.

The previous prime is 128231657. The next prime is 128231671. The reversal of 128231659 is 956132821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128231659 - 2¹ = 128231657 is a prime.

Together with 128231657, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128231657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64115829 + 64115830.

It is an arithmetic number, because the mean of its divisors is an integer number (64115830).

Almost surely, 2^128231659 is an apocalyptic number.

128231659 is a deficient number, since it is larger than the sum of its proper divisors (1).

128231659 is an equidigital number, since it uses as much as digits as its factorization.

128231659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 128231659 is about 11323.9418490206. The cubic root of 128231659 is about 504.2722701112.

The spelling of 128231659 in words is "one hundred twenty-eight million, two hundred thirty-one thousand, six hundred fifty-nine".