128272811 has 2 divisors, whose sum is σ = 128272812. Its totient is φ = 128272810.

The previous prime is 128272783. The next prime is 128272831. The reversal of 128272811 is 118272821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128272811 is a prime.

It is not a weakly prime, because it can be changed into another prime (128272831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64136405 + 64136406.

It is an arithmetic number, because the mean of its divisors is an integer number (64136406).

Almost surely, 2^128272811 is an apocalyptic number.

128272811 is a deficient number, since it is larger than the sum of its proper divisors (1).

128272811 is an equidigital number, since it uses as much as digits as its factorization.

128272811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 32.

The square root of 128272811 is about 11325.7587383804. The cubic root of 128272811 is about 504.3262078911.

The spelling of 128272811 in words is "one hundred twenty-eight million, two hundred seventy-two thousand, eight hundred eleven".