231331140 has 72 divisors (see below), whose sum is σ = 727708800. Its totient is φ = 61687008.

The previous prime is 231331117. The next prime is 231331147. The reversal of 231331140 is 41133132.

231331140 is a `hidden beast` number, since 2 + 313 + 311 + 40 = 666.

231331140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (231331147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18940 + ... + 28659.

Almost surely, 2^231331140 is an apocalyptic number.

231331140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231331140 is an abundant number, since it is smaller than the sum of its proper divisors (496377660).

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

231331140 is a wasteful number, since it uses less digits than its factorization.

231331140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47623 (or 47609 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231331140 is about 15209.5739585302. The cubic root of 231331140 is about 613.8722939246.

Adding to 231331140 its reverse (41133132), we get a palindrome (272464272).

The spelling of 231331140 in words is "two hundred thirty-one million, three hundred thirty-one thousand, one hundred forty".