128713105 has 4 divisors (see below), whose sum is σ = 154455732. Its totient is φ = 102970480.

The previous prime is 128713099. The next prime is 128713141. The reversal of 128713105 is 501317821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15673681 + 113039424 = 3959^2 + 10632^2 .

It is not a de Polignac number, because 128713105 - 2²¹ = 126615953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12871306 + ... + 12871315.

It is an arithmetic number, because the mean of its divisors is an integer number (38613933).

Almost surely, 2^128713105 is an apocalyptic number.

It is an amenable number.

128713105 is a deficient number, since it is larger than the sum of its proper divisors (25742627).

128713105 is an equidigital number, since it uses as much as digits as its factorization.

128713105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25742626.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 128713105 is about 11345.1798134714. The cubic root of 128713105 is about 504.9025789920.

The spelling of 128713105 in words is "one hundred twenty-eight million, seven hundred thirteen thousand, one hundred five".