128112517 has 8 divisors (see below), whose sum is σ = 142725240. Its totient is φ = 114179520.

The previous prime is 128112503. The next prime is 128112521. The reversal of 128112517 is 715211821.

It can be written as a sum of positive squares in 4 ways, for example, as 1572516 + 126540001 = 1254^2 + 11249^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128112517 - 2¹¹ = 128110469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128112317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169534 + ... + 170287.

It is an arithmetic number, because the mean of its divisors is an integer number (17840655).

Almost surely, 2^128112517 is an apocalyptic number.

It is an amenable number.

128112517 is a deficient number, since it is larger than the sum of its proper divisors (14612723).

128112517 is a wasteful number, since it uses less digits than its factorization.

128112517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339863.

The product of its digits is 1120, while the sum is 28.

The square root of 128112517 is about 11318.6800025445. The cubic root of 128112517 is about 504.1160460192.

The spelling of 128112517 in words is "one hundred twenty-eight million, one hundred twelve thousand, five hundred seventeen".