128248751 has 4 divisors (see below), whose sum is σ = 128317032. Its totient is φ = 128180472.

The previous prime is 128248741. The next prime is 128248807. The reversal of 128248751 is 157842821.

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 128248751 - 2²⁶ = 61139887 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 (128248721) 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, 31241 + ... + 35106.

It is an arithmetic number, because the mean of its divisors is an integer number (32079258).

Almost surely, 2^128248751 is an apocalyptic number.

128248751 is a deficient number, since it is larger than the sum of its proper divisors (68281).

128248751 is an equidigital number, since it uses as much as digits as its factorization.

128248751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68280.

The product of its digits is 35840, while the sum is 38.

The square root of 128248751 is about 11324.6965080747. The cubic root of 128248751 is about 504.2946739357.

The spelling of 128248751 in words is "one hundred twenty-eight million, two hundred forty-eight thousand, seven hundred fifty-one".