128871231 has 16 divisors (see below), whose sum is σ = 181049856. Its totient is φ = 81376416.

The previous prime is 128871221. The next prime is 128871233. The reversal of 128871231 is 132178821.

It is not a de Polignac number, because 128871231 - 2¹¹ = 128869183 is a prime.

It is a super-2 number, since 2×128871231² = 33215588358910722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128871192 and 128871201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128871233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1960 + ... + 16173.

It is an arithmetic number, because the mean of its divisors is an integer number (11315616).

Almost surely, 2^128871231 is an apocalyptic number.

128871231 is a deficient number, since it is larger than the sum of its proper divisors (52178625).

128871231 is a wasteful number, since it uses less digits than its factorization.

128871231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18262.

The product of its digits is 5376, while the sum is 33.

The square root of 128871231 is about 11352.1465371092. The cubic root of 128871231 is about 505.1092545369.

The spelling of 128871231 in words is "one hundred twenty-eight million, eight hundred seventy-one thousand, two hundred thirty-one".