128271513 has 4 divisors (see below), whose sum is σ = 171028688. Its totient is φ = 85514340.

The previous prime is 128271509. The next prime is 128271523. The reversal of 128271513 is 315172821.

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 not a de Polignac number, because 128271513 - 2² = 128271509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128271523) 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, 21378583 + ... + 21378588.

It is an arithmetic number, because the mean of its divisors is an integer number (42757172).

Almost surely, 2^128271513 is an apocalyptic number.

It is an amenable number.

128271513 is a deficient number, since it is larger than the sum of its proper divisors (42757175).

128271513 is an equidigital number, since it uses as much as digits as its factorization.

128271513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42757174.

The product of its digits is 3360, while the sum is 30.

The square root of 128271513 is about 11325.7014352313. The cubic root of 128271513 is about 504.3245067833.

The spelling of 128271513 in words is "one hundred twenty-eight million, two hundred seventy-one thousand, five hundred thirteen".