128406511 has 2 divisors, whose sum is σ = 128406512. Its totient is φ = 128406510.

The previous prime is 128406497. The next prime is 128406517. The reversal of 128406511 is 115604821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128406511 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128406511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128406517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64203255 + 64203256.

It is an arithmetic number, because the mean of its divisors is an integer number (64203256).

Almost surely, 2^128406511 is an apocalyptic number.

128406511 is a deficient number, since it is larger than the sum of its proper divisors (1).

128406511 is an equidigital number, since it uses as much as digits as its factorization.

128406511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 128406511 is about 11331.6596754403. The cubic root of 128406511 is about 504.5013684205.

The spelling of 128406511 in words is "one hundred twenty-eight million, four hundred six thousand, five hundred eleven".