128918417 has 2 divisors, whose sum is σ = 128918418. Its totient is φ = 128918416.

The previous prime is 128918411. The next prime is 128918431. The reversal of 128918417 is 714819821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69072721 + 59845696 = 8311^2 + 7736^2 .

It is a cyclic number.

It is not a de Polignac number, because 128918417 - 2⁶ = 128918353 is a prime.

It is not a weakly prime, because it can be changed into another prime (128918411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64459208 + 64459209.

It is an arithmetic number, because the mean of its divisors is an integer number (64459209).

Almost surely, 2^128918417 is an apocalyptic number.

It is an amenable number.

128918417 is a deficient number, since it is larger than the sum of its proper divisors (1).

128918417 is an equidigital number, since it uses as much as digits as its factorization.

128918417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 41.

The square root of 128918417 is about 11354.2246322679. The cubic root of 128918417 is about 505.1708953359.

The spelling of 128918417 in words is "one hundred twenty-eight million, nine hundred eighteen thousand, four hundred seventeen".