128751243 has 4 divisors (see below), whose sum is σ = 171668328. Its totient is φ = 85834160.

The previous prime is 128751229. The next prime is 128751247. The reversal of 128751243 is 342157821.

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 128751243 - 2⁶ = 128751179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128751247) 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, 21458538 + ... + 21458543.

It is an arithmetic number, because the mean of its divisors is an integer number (42917082).

Almost surely, 2^128751243 is an apocalyptic number.

128751243 is a deficient number, since it is larger than the sum of its proper divisors (42917085).

128751243 is an equidigital number, since it uses as much as digits as its factorization.

128751243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42917084.

The product of its digits is 13440, while the sum is 33.

The square root of 128751243 is about 11346.8604909023. The cubic root of 128751243 is about 504.9524420136.

The spelling of 128751243 in words is "one hundred twenty-eight million, seven hundred fifty-one thousand, two hundred forty-three".