128131289 has 16 divisors (see below), whose sum is σ = 150885504. Its totient is φ = 107270400.

The previous prime is 128131249. The next prime is 128131291. The reversal of 128131289 is 982131821.

It is a cyclic number.

It is not a de Polignac number, because 128131289 - 2⁸ = 128131033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128131219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84044 + ... + 85554.

It is an arithmetic number, because the mean of its divisors is an integer number (9430344).

Almost surely, 2^128131289 is an apocalyptic number.

It is an amenable number.

128131289 is a deficient number, since it is larger than the sum of its proper divisors (22754215).

128131289 is a wasteful number, since it uses less digits than its factorization.

128131289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128.

The product of its digits is 6912, while the sum is 35.

The square root of 128131289 is about 11319.5092208099. The cubic root of 128131289 is about 504.1406670957.

The spelling of 128131289 in words is "one hundred twenty-eight million, one hundred thirty-one thousand, two hundred eighty-nine".