128751491 has 8 divisors (see below), whose sum is σ = 140540400. Its totient is φ = 116976640.

The previous prime is 128751479. The next prime is 128751529. The reversal of 128751491 is 194157821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128751491 - 2¹⁰ = 128750467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128751191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27875 + ... + 32163.

It is an arithmetic number, because the mean of its divisors is an integer number (17567550).

Almost surely, 2^128751491 is an apocalyptic number.

128751491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128751491 is a deficient number, since it is larger than the sum of its proper divisors (11788909).

128751491 is a wasteful number, since it uses less digits than its factorization.

128751491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7029.

The product of its digits is 20160, while the sum is 38.

The square root of 128751491 is about 11346.8714190300. The cubic root of 128751491 is about 504.9527662257.

The spelling of 128751491 in words is "one hundred twenty-eight million, seven hundred fifty-one thousand, four hundred ninety-one".