128475691 has 2 divisors, whose sum is σ = 128475692. Its totient is φ = 128475690.

The previous prime is 128475679. The next prime is 128475719. The reversal of 128475691 is 196574821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128475691 - 2¹⁹ = 127951403 is a prime.

It is not a weakly prime, because it can be changed into another prime (128475091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64237845 + 64237846.

It is an arithmetic number, because the mean of its divisors is an integer number (64237846).

Almost surely, 2^128475691 is an apocalyptic number.

128475691 is a deficient number, since it is larger than the sum of its proper divisors (1).

128475691 is an equidigital number, since it uses as much as digits as its factorization.

128475691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 128475691 is about 11334.7117740153. The cubic root of 128475691 is about 504.5919534915.

The spelling of 128475691 in words is "one hundred twenty-eight million, four hundred seventy-five thousand, six hundred ninety-one".