231552 has 64 divisors (see below), whose sum is σ = 693600. Its totient is φ = 76032.

The previous prime is 231551. The next prime is 231559. The reversal of 231552 is 255132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (231551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3423 + ... + 3489.

2²³¹⁵⁵² 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 231552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346800).

231552 is an abundant number, since it is smaller than the sum of its proper divisors (462048).

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

231552 is an equidigital number, since it uses as much as digits as its factorization.

231552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 72 counting only the distinct ones).

The product of its digits is 300, while the sum is 18.

The square root of 231552 is about 481.1985037383. The cubic root of 231552 is about 61.4067593629.

Adding to 231552 its reverse (255132), we get a palindrome (486684).

The spelling of 231552 in words is "two hundred thirty-one thousand, five hundred fifty-two".