128271257 has 4 divisors (see below), whose sum is σ = 128295120. Its totient is φ = 128247396.

The previous prime is 128271191. The next prime is 128271259. The reversal of 128271257 is 752172821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 752172821 = 4253 ⋅176857.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128271257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128271259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338 + ... + 16020.

It is an arithmetic number, because the mean of its divisors is an integer number (32073780).

Almost surely, 2^128271257 is an apocalyptic number.

It is an amenable number.

128271257 is a deficient number, since it is larger than the sum of its proper divisors (23863).

128271257 is an equidigital number, since it uses as much as digits as its factorization.

128271257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23862.

The product of its digits is 15680, while the sum is 35.

The square root of 128271257 is about 11325.6901334974. The cubic root of 128271257 is about 504.3241712784.

The spelling of 128271257 in words is "one hundred twenty-eight million, two hundred seventy-one thousand, two hundred fifty-seven".