128811899 has 2 divisors, whose sum is σ = 128811900. Its totient is φ = 128811898.

The previous prime is 128811869. The next prime is 128811919. The reversal of 128811899 is 998118821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128811899 - 2⁸ = 128811643 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128811869) 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, 64405949 + 64405950.

It is an arithmetic number, because the mean of its divisors is an integer number (64405950).

Almost surely, 2^128811899 is an apocalyptic number.

128811899 is a deficient number, since it is larger than the sum of its proper divisors (1).

128811899 is an equidigital number, since it uses as much as digits as its factorization.

128811899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 47.

The square root of 128811899 is about 11349.5329859867. The cubic root of 128811899 is about 505.0317256153.

The spelling of 128811899 in words is "one hundred twenty-eight million, eight hundred eleven thousand, eight hundred ninety-nine".