128513389 has 4 divisors (see below), whose sum is σ = 128613024. Its totient is φ = 128413756.

The previous prime is 128513381. The next prime is 128513447. The reversal of 128513389 is 983315821.

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 not a de Polignac number, because 128513389 - 2³ = 128513381 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128513381) 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 in 3 ways as a sum of consecutive naturals, for example, 47857 + ... + 50470.

It is an arithmetic number, because the mean of its divisors is an integer number (32153256).

Almost surely, 2^128513389 is an apocalyptic number.

It is an amenable number.

128513389 is a deficient number, since it is larger than the sum of its proper divisors (99635).

128513389 is an equidigital number, since it uses as much as digits as its factorization.

128513389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99634.

The product of its digits is 51840, while the sum is 40.

The square root of 128513389 is about 11336.3745968453. The cubic root of 128513389 is about 504.6413019897.

The spelling of 128513389 in words is "one hundred twenty-eight million, five hundred thirteen thousand, three hundred eighty-nine".