231240132 has 18 divisors (see below), whose sum is σ = 584523758. Its totient is φ = 77080032.

The previous prime is 231240131. The next prime is 231240179. The reversal of 231240132 is 231042132.

231240132 is a `hidden beast` number, since 231 + 2 + 401 + 32 = 666.

It can be written as a sum of positive squares in only one way, i.e., 132158016 + 99082116 = 11496^2 + 9954^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is not an unprimeable number, because it can be changed into a prime (231240131) 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 5 ways as a sum of consecutive naturals, for example, 3211633 + ... + 3211704.

Almost surely, 2^231240132 is an apocalyptic number.

It is an amenable number.

231240132 is an abundant number, since it is smaller than the sum of its proper divisors (353283626).

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

231240132 is a wasteful number, since it uses less digits than its factorization.

231240132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6423347 (or 6423342 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231240132 is about 15206.5818644428. The cubic root of 231240132 is about 613.7917821849.

Adding to 231240132 its reverse (231042132), we get a palindrome (462282264).

The spelling of 231240132 in words is "two hundred thirty-one million, two hundred forty thousand, one hundred thirty-two".