128641231 has 8 divisors (see below), whose sum is σ = 137509344. Its totient is φ = 120046080.

The previous prime is 128641213. The next prime is 128641241. The reversal of 128641231 is 132146821.

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

It is a cyclic number.

It is not a de Polignac number, because 128641231 - 2²³ = 120252623 is a prime.

It is a super-2 number, since 2×128641231² = 33097132626390722, which contains 22 as substring.

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 128641231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128641241) 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 7 ways as a sum of consecutive naturals, for example, 67266 + ... + 69151.

It is an arithmetic number, because the mean of its divisors is an integer number (17188668).

Almost surely, 2^128641231 is an apocalyptic number.

128641231 is a deficient number, since it is larger than the sum of its proper divisors (8868113).

128641231 is a wasteful number, since it uses less digits than its factorization.

128641231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136481.

The product of its digits is 2304, while the sum is 28.

The square root of 128641231 is about 11342.0117704048. The cubic root of 128641231 is about 504.8085815062.

The spelling of 128641231 in words is "one hundred twenty-eight million, six hundred forty-one thousand, two hundred thirty-one".