128507513 has 2 divisors, whose sum is σ = 128507514. Its totient is φ = 128507512.

The previous prime is 128507479. The next prime is 128507543. The reversal of 128507513 is 315705821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120934009 + 7573504 = 10997^2 + 2752^2 .

It is a cyclic number.

It is not a de Polignac number, because 128507513 - 2²² = 124313209 is a prime.

It is equal to p_7298141 and since 128507513 and 7298141 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128507513.

It is not a weakly prime, because it can be changed into another prime (128507543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64253756 + 64253757.

It is an arithmetic number, because the mean of its divisors is an integer number (64253757).

Almost surely, 2^128507513 is an apocalyptic number.

It is an amenable number.

128507513 is a deficient number, since it is larger than the sum of its proper divisors (1).

128507513 is an equidigital number, since it uses as much as digits as its factorization.

128507513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 128507513 is about 11336.1154281350. The cubic root of 128507513 is about 504.6336106576.

The spelling of 128507513 in words is "one hundred twenty-eight million, five hundred seven thousand, five hundred thirteen".