231231140 has 48 divisors (see below), whose sum is σ = 584169600. Its totient is φ = 75105792.

The previous prime is 231231131. The next prime is 231231151. The reversal of 231231140 is 41132132.

231231140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 40805 + ... + 46124.

It is an arithmetic number, because the mean of its divisors is an integer number (12170200).

Almost surely, 2^231231140 is an apocalyptic number.

231231140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231231140 is an abundant number, since it is smaller than the sum of its proper divisors (352938460).

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

231231140 is a wasteful number, since it uses less digits than its factorization.

231231140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86964 (or 86962 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 231231140 is about 15206.2862001213. The cubic root of 231231140 is about 613.7838261160.

Adding to 231231140 its reverse (41132132), we get a palindrome (272363272).

The spelling of 231231140 in words is "two hundred thirty-one million, two hundred thirty-one thousand, one hundred forty".