128242811 has 2 divisors, whose sum is σ = 128242812. Its totient is φ = 128242810.

The previous prime is 128242789. The next prime is 128242819. The reversal of 128242811 is 118242821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128242811 - 2¹⁰ = 128241787 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (128242819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64121405 + 64121406.

It is an arithmetic number, because the mean of its divisors is an integer number (64121406).

Almost surely, 2^128242811 is an apocalyptic number.

128242811 is a deficient number, since it is larger than the sum of its proper divisors (1).

128242811 is an equidigital number, since it uses as much as digits as its factorization.

128242811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 29.

The square root of 128242811 is about 11324.4342463542. The cubic root of 128242811 is about 504.2868881377.

The spelling of 128242811 in words is "one hundred twenty-eight million, two hundred forty-two thousand, eight hundred eleven".