231437128 has 32 divisors (see below), whose sum is σ = 478731960. Its totient is φ = 104209920.

The previous prime is 231437123. The next prime is 231437153. The reversal of 231437128 is 821734132.

It can be written as a sum of positive squares in 4 ways, for example, as 54493924 + 176943204 = 7382^2 + 13302^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 231437128.

It is not an unprimeable number, because it can be changed into a prime (231437123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22875 + ... + 31402.

Almost surely, 2^231437128 is an apocalyptic number.

It is an amenable number.

231437128 is an abundant number, since it is smaller than the sum of its proper divisors (247294832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231437128 is a wasteful number, since it uses less digits than its factorization.

231437128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54337 (or 54333 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 231437128 is about 15213.0578122874. The cubic root of 231437128 is about 613.9660313590.

The spelling of 231437128 in words is "two hundred thirty-one million, four hundred thirty-seven thousand, one hundred twenty-eight".