128069291 has 24 divisors (see below), whose sum is σ = 158031360. Its totient is φ = 103194000.

The previous prime is 128069261. The next prime is 128069311. The reversal of 128069291 is 192960821.

It is a de Polignac number, because none of the positive numbers 2^k-128069291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128069231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140126 + ... + 141036.

It is an arithmetic number, because the mean of its divisors is an integer number (6584640).

Almost surely, 2^128069291 is an apocalyptic number.

128069291 is a deficient number, since it is larger than the sum of its proper divisors (29962069).

128069291 is a wasteful number, since it uses less digits than its factorization.

128069291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 128069291 is about 11316.7703431677. The cubic root of 128069291 is about 504.0593422924.

The spelling of 128069291 in words is "one hundred twenty-eight million, sixty-nine thousand, two hundred ninety-one".