128699671 has 2 divisors, whose sum is σ = 128699672. Its totient is φ = 128699670.

The previous prime is 128699609. The next prime is 128699687. The reversal of 128699671 is 176996821.

It is a strong prime.

It is an emirp because it is prime and its reverse (176996821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128699671 - 2¹¹ = 128697623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128699171) 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, 64349835 + 64349836.

It is an arithmetic number, because the mean of its divisors is an integer number (64349836).

Almost surely, 2^128699671 is an apocalyptic number.

128699671 is a deficient number, since it is larger than the sum of its proper divisors (1).

128699671 is an equidigital number, since it uses as much as digits as its factorization.

128699671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 128699671 is about 11344.5877404161. The cubic root of 128699671 is about 504.8850125413.

The spelling of 128699671 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, six hundred seventy-one".