128315125 has 8 divisors (see below), whose sum is σ = 160137432. Its totient is φ = 102652000.

The previous prime is 128315101. The next prime is 128315141. The reversal of 128315125 is 521513821.

It can be written as a sum of positive squares in 4 ways, for example, as 195364 + 128119761 = 442^2 + 11319^2 .

It is a de Polignac number, because none of the positive numbers 2^k-128315125 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128315093 and 128315102.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 513136 + ... + 513385.

It is an arithmetic number, because the mean of its divisors is an integer number (20017179).

Almost surely, 2^128315125 is an apocalyptic number.

It is an amenable number.

128315125 is a deficient number, since it is larger than the sum of its proper divisors (31822307).

128315125 is an equidigital number, since it uses as much as digits as its factorization.

128315125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026536 (or 1026526 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 128315125 is about 11327.6266269682. The cubic root of 128315125 is about 504.3816566722.

Adding to 128315125 its reverse (521513821), we get a palindrome (649828946).

It can be divided in two parts, 12831 and 5125, that added together give a square (17956 = 134²).

The spelling of 128315125 in words is "one hundred twenty-eight million, three hundred fifteen thousand, one hundred twenty-five".