231033312 has 72 divisors (see below), whose sum is σ = 691596360. Its totient is φ = 72956160.

The previous prime is 231033301. The next prime is 231033317. The reversal of 231033312 is 213330132.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231033317) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15639 + ... + 26582.

It is an arithmetic number, because the mean of its divisors is an integer number (9605505).

Almost surely, 2^231033312 is an apocalyptic number.

It is an amenable number.

231033312 is an abundant number, since it is smaller than the sum of its proper divisors (460563048).

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

231033312 is a wasteful number, since it uses less digits than its factorization.

231033312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42256 (or 42245 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 231033312 is about 15199.7799984079. The cubic root of 231033312 is about 613.6087368512.

Adding to 231033312 its reverse (213330132), we get a palindrome (444363444).

The spelling of 231033312 in words is "two hundred thirty-one million, thirty-three thousand, three hundred twelve".