128411391 has 16 divisors (see below), whose sum is σ = 177521760. Its totient is φ = 82467840.

The previous prime is 128411389. The next prime is 128411417. The reversal of 128411391 is 193114821.

It is not a de Polignac number, because 128411391 - 2¹ = 128411389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128411321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43911 + ... + 46743.

It is an arithmetic number, because the mean of its divisors is an integer number (11095110).

Almost surely, 2^128411391 is an apocalyptic number.

128411391 is a deficient number, since it is larger than the sum of its proper divisors (49110369).

128411391 is a wasteful number, since it uses less digits than its factorization.

128411391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386.

The product of its digits is 1728, while the sum is 30.

The square root of 128411391 is about 11331.8749993106. The cubic root of 128411391 is about 504.5077594139.

The spelling of 128411391 in words is "one hundred twenty-eight million, four hundred eleven thousand, three hundred ninety-one".