128128811 has 2 divisors, whose sum is σ = 128128812. Its totient is φ = 128128810.

The previous prime is 128128789. The next prime is 128128831. The reversal of 128128811 is 118821821.

It is a strong prime.

It is an emirp because it is prime and its reverse (118821821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128128811 - 2¹⁴ = 128112427 is a prime.

It is not a weakly prime, because it can be changed into another prime (128128831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64064405 + 64064406.

It is an arithmetic number, because the mean of its divisors is an integer number (64064406).

Almost surely, 2^128128811 is an apocalyptic number.

128128811 is a deficient number, since it is larger than the sum of its proper divisors (1).

128128811 is an equidigital number, since it uses as much as digits as its factorization.

128128811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2048, while the sum is 32.

The square root of 128128811 is about 11319.3997632383. The cubic root of 128128811 is about 504.1374171254.

The spelling of 128128811 in words is "one hundred twenty-eight million, one hundred twenty-eight thousand, eight hundred eleven".