128517243 has 16 divisors (see below), whose sum is σ = 176315136. Its totient is φ = 83207520.

The previous prime is 128517203. The next prime is 128517251. The reversal of 128517243 is 342715821.

It is not a de Polignac number, because 128517243 - 2⁸ = 128516987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128517203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113880 + ... + 115002.

It is an arithmetic number, because the mean of its divisors is an integer number (11019696).

Almost surely, 2^128517243 is an apocalyptic number.

128517243 is a deficient number, since it is larger than the sum of its proper divisors (47797893).

128517243 is a wasteful number, since it uses less digits than its factorization.

128517243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194.

The product of its digits is 13440, while the sum is 33.

The square root of 128517243 is about 11336.5445793681. The cubic root of 128517243 is about 504.6463465177.

It can be divided in two parts, 1285 and 17243, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 128517243 in words is "one hundred twenty-eight million, five hundred seventeen thousand, two hundred forty-three".