128251039 has 4 divisors (see below), whose sum is σ = 146572624. Its totient is φ = 109929456.

The previous prime is 128251037. The next prime is 128251087. The reversal of 128251039 is 930152821.

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

It is not a de Polignac number, because 128251039 - 2¹ = 128251037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128251039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128251033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9160782 + ... + 9160795.

It is an arithmetic number, because the mean of its divisors is an integer number (36643156).

Almost surely, 2^128251039 is an apocalyptic number.

128251039 is a deficient number, since it is larger than the sum of its proper divisors (18321585).

128251039 is an equidigital number, since it uses as much as digits as its factorization.

128251039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18321584.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 128251039 is about 11324.7975257838. The cubic root of 128251039 is about 504.2976728456.

The spelling of 128251039 in words is "one hundred twenty-eight million, two hundred fifty-one thousand, thirty-nine".