128138627 has 2 divisors, whose sum is σ = 128138628. Its totient is φ = 128138626.

The previous prime is 128138611. The next prime is 128138629. The reversal of 128138627 is 726831821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128138627 - 2⁴ = 128138611 is a prime.

Together with 128138629, 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 (128138629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64069313 + 64069314.

It is an arithmetic number, because the mean of its divisors is an integer number (64069314).

Almost surely, 2^128138627 is an apocalyptic number.

128138627 is a deficient number, since it is larger than the sum of its proper divisors (1).

128138627 is an equidigital number, since it uses as much as digits as its factorization.

128138627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 128138627 is about 11319.8333468298. The cubic root of 128138627 is about 504.1502908538.

The spelling of 128138627 in words is "one hundred twenty-eight million, one hundred thirty-eight thousand, six hundred twenty-seven".