231533432 has 16 divisors (see below), whose sum is σ = 467519640. Its totient is φ = 106861536.

The previous prime is 231533431. The next prime is 231533453. The reversal of 231533432 is 234335132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231533431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113038 + ... + 1113245.

Almost surely, 2^231533432 is an apocalyptic number.

It is an amenable number.

231533432 is an abundant number, since it is smaller than the sum of its proper divisors (235986208).

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

231533432 is a wasteful number, since it uses less digits than its factorization.

231533432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226302 (or 2226298 counting only the distinct ones).

The product of its digits is 6480, while the sum is 26.

The square root of 231533432 is about 15216.2226587284. Note that the first 3 decimals coincide. The cubic root of 231533432 is about 614.0511793008.

Adding to 231533432 its reverse (234335132), we get a palindrome (465868564).

The spelling of 231533432 in words is "two hundred thirty-one million, five hundred thirty-three thousand, four hundred thirty-two".