128142231 has 16 divisors (see below), whose sum is σ = 195436800. Its totient is φ = 73159488.

The previous prime is 128142173. The next prime is 128142247. The reversal of 128142231 is 132241821.

It is not a de Polignac number, because 128142231 - 2¹⁵ = 128109463 is a prime.

It is a super-2 number, since 2×128142231² = 32840862731314722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128142281) 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, 32115 + ... + 35883.

It is an arithmetic number, because the mean of its divisors is an integer number (12214800).

Almost surely, 2^128142231 is an apocalyptic number.

128142231 is a deficient number, since it is larger than the sum of its proper divisors (67294569).

128142231 is a wasteful number, since it uses less digits than its factorization.

128142231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5398.

The product of its digits is 768, while the sum is 24.

The square root of 128142231 is about 11319.9925353332. The cubic root of 128142231 is about 504.1550173511.

The spelling of 128142231 in words is "one hundred twenty-eight million, one hundred forty-two thousand, two hundred thirty-one".