8128517243 has 64 divisors (see below), whose sum is σ = 10972800000. Its totient is φ = 5952441600.

The previous prime is 8128517237. The next prime is 8128517263. The reversal of 8128517243 is 3427158218.

It is not a de Polignac number, because 8128517243 - 2⁶ = 8128517179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8128517243.

It is not an unprimeable number, because it can be changed into a prime (8128517203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10680983 + ... + 10681743.

It is an arithmetic number, because the mean of its divisors is an integer number (171450000).

Almost surely, 2^8128517243 is an apocalyptic number.

8128517243 is a deficient number, since it is larger than the sum of its proper divisors (2844282757).

8128517243 is a wasteful number, since it uses less digits than its factorization.

8128517243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 947 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 8128517243 is about 90158.2899294347. The cubic root of 8128517243 is about 2010.6529270769.

The spelling of 8128517243 in words is "eight billion, one hundred twenty-eight million, five hundred seventeen thousand, two hundred forty-three".