128055899 has 2 divisors, whose sum is σ = 128055900. Its totient is φ = 128055898.

The previous prime is 128055869. The next prime is 128055911. The reversal of 128055899 is 998550821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128055899 - 2⁸ = 128055643 is a prime.

It is not a weakly prime, because it can be changed into another prime (128055859) 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, 64027949 + 64027950.

It is an arithmetic number, because the mean of its divisors is an integer number (64027950).

Almost surely, 2^128055899 is an apocalyptic number.

128055899 is a deficient number, since it is larger than the sum of its proper divisors (1).

128055899 is an equidigital number, since it uses as much as digits as its factorization.

128055899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 47.

The square root of 128055899 is about 11316.1786394525. The cubic root of 128055899 is about 504.0417721215.

The spelling of 128055899 in words is "one hundred twenty-eight million, fifty-five thousand, eight hundred ninety-nine".