128391199 has 2 divisors, whose sum is σ = 128391200. Its totient is φ = 128391198.

The previous prime is 128391187. The next prime is 128391233. The reversal of 128391199 is 991193821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128391199 - 2⁷ = 128391071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128391299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64195599 + 64195600.

It is an arithmetic number, because the mean of its divisors is an integer number (64195600).

Almost surely, 2^128391199 is an apocalyptic number.

128391199 is a deficient number, since it is larger than the sum of its proper divisors (1).

128391199 is an equidigital number, since it uses as much as digits as its factorization.

128391199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 43.

The square root of 128391199 is about 11330.9840261118. The cubic root of 128391199 is about 504.4813143179.

The spelling of 128391199 in words is "one hundred twenty-eight million, three hundred ninety-one thousand, one hundred ninety-nine".