231143128 has 16 divisors (see below), whose sum is σ = 436054680. Its totient is φ = 114861888.

The previous prime is 231143119. The next prime is 231143141. The reversal of 231143128 is 821341132.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 87325 + ... + 89932.

Almost surely, 2^231143128 is an apocalyptic number.

It is an amenable number.

231143128 is a deficient number, since it is larger than the sum of its proper divisors (204911552).

231143128 is a wasteful number, since it uses less digits than its factorization.

231143128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177426 (or 177422 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 231143128 is about 15203.3919899475. The cubic root of 231143128 is about 613.7059427229.

The spelling of 231143128 in words is "two hundred thirty-one million, one hundred forty-three thousand, one hundred twenty-eight".