128518513 has 4 divisors (see below), whose sum is σ = 128564208. Its totient is φ = 128472820.

The previous prime is 128518493. The next prime is 128518531. The reversal of 128518513 is 315815821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128518513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128518553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18331 + ... + 24352.

It is an arithmetic number, because the mean of its divisors is an integer number (32141052).

Almost surely, 2^128518513 is an apocalyptic number.

It is an amenable number.

128518513 is a deficient number, since it is larger than the sum of its proper divisors (45695).

128518513 is an equidigital number, since it uses as much as digits as its factorization.

128518513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45694.

The product of its digits is 9600, while the sum is 34.

The square root of 128518513 is about 11336.6005927703. The cubic root of 128518513 is about 504.6480088076.

The spelling of 128518513 in words is "one hundred twenty-eight million, five hundred eighteen thousand, five hundred thirteen".