128271751 has 4 divisors (see below), whose sum is σ = 128352600. Its totient is φ = 128190904.

The previous prime is 128271721. The next prime is 128271761. The reversal of 128271751 is 157172821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128271751 - 2⁵ = 128271719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128271721) 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, 37996 + ... + 41233.

It is an arithmetic number, because the mean of its divisors is an integer number (32088150).

Almost surely, 2^128271751 is an apocalyptic number.

128271751 is a deficient number, since it is larger than the sum of its proper divisors (80849).

128271751 is an equidigital number, since it uses as much as digits as its factorization.

128271751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80848.

The product of its digits is 7840, while the sum is 34.

The square root of 128271751 is about 11325.7119423019. The cubic root of 128271751 is about 504.3248186976.

The spelling of 128271751 in words is "one hundred twenty-eight million, two hundred seventy-one thousand, seven hundred fifty-one".