8128513 has 2 divisors, whose sum is σ = 8128514. Its totient is φ = 8128512.

The previous prime is 8128511. The next prime is 8128543. The reversal of 8128513 is 3158218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8105409 + 23104 = 2847^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 8128513 - 2¹ = 8128511 is a prime.

Together with 8128511, it forms a pair of twin primes.

8128513 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8128511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4064256 + 4064257.

It is an arithmetic number, because the mean of its divisors is an integer number (4064257).

Almost surely, 2^8128513 is an apocalyptic number.

It is an amenable number.

8128513 is a deficient number, since it is larger than the sum of its proper divisors (1).

8128513 is an equidigital number, since it uses as much as digits as its factorization.

8128513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The square root of 8128513 is about 2851.0547171179. The cubic root of 8128513 is about 201.0652577230.

The spelling of 8128513 in words is "eight million, one hundred twenty-eight thousand, five hundred thirteen".