231533232 has 140 divisors (see below), whose sum is σ = 714834456. Its totient is φ = 64538880.

The previous prime is 231533227. The next prime is 231533257. The reversal of 231533232 is 232335132.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5647132 + ... + 5647172.

Almost surely, 2^231533232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231533232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357417228).

231533232 is an abundant number, since it is smaller than the sum of its proper divisors (483301224).

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

231533232 is an frugal number, since it uses more digits than its factorization.

231533232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 53 counting only the distinct ones).

The product of its digits is 3240, while the sum is 24.

The square root of 231533232 is about 15216.2160867937. The cubic root of 231533232 is about 614.0510024937.

Adding to 231533232 its reverse (232335132), we get a palindrome (463868364).

The spelling of 231533232 in words is "two hundred thirty-one million, five hundred thirty-three thousand, two hundred thirty-two".