231530133144 has 32 divisors (see below), whose sum is σ = 603991653120. Its totient is φ = 73821201696.

The previous prime is 231530133083. The next prime is 231530133151. The reversal of 231530133144 is 441331035132.

It is a happy number.

231530133144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209718772 + ... + 209719875.

It is an arithmetic number, because the mean of its divisors is an integer number (18874739160).

Almost surely, 2^231530133144 is an apocalyptic number.

231530133144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231530133144 is an abundant number, since it is smaller than the sum of its proper divisors (372461519976).

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

231530133144 is a wasteful number, since it uses less digits than its factorization.

231530133144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419438679 (or 419438675 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 231530133144 its reverse (441331035132), we get a palindrome (672861168276).

The spelling of 231530133144 in words is "two hundred thirty-one billion, five hundred thirty million, one hundred thirty-three thousand, one hundred forty-four".