231143432 has 16 divisors (see below), whose sum is σ = 466732140. Its totient is φ = 106681536.

The previous prime is 231143387. The next prime is 231143443. The reversal of 231143432 is 234341132.

It can be written as a sum of positive squares in 2 ways, for example, as 196168036 + 34975396 = 14006^2 + 5914^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231143398 and 231143407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111163 + ... + 1111370.

Almost surely, 2^231143432 is an apocalyptic number.

It is an amenable number.

231143432 is an abundant number, since it is smaller than the sum of its proper divisors (235588708).

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

231143432 is a wasteful number, since it uses less digits than its factorization.

231143432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222552 (or 2222548 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 231143432 is about 15203.4019877131. The cubic root of 231143432 is about 613.7062117719.

Adding to 231143432 its reverse (234341132), we get a palindrome (465484564).

The spelling of 231143432 in words is "two hundred thirty-one million, one hundred forty-three thousand, four hundred thirty-two".