231311240 has 32 divisors (see below), whose sum is σ = 523779480. Its totient is φ = 91932672.

The previous prime is 231311219. The next prime is 231311251. The reversal of 231311240 is 42113132.

231311240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 87647044 + 143664196 = 9362^2 + 11986^2 .

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 7 ways as a sum of consecutive naturals, for example, 12137 + ... + 24696.

Almost surely, 2^231311240 is an apocalyptic number.

231311240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231311240 is an abundant number, since it is smaller than the sum of its proper divisors (292468240).

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

231311240 is a wasteful number, since it uses less digits than its factorization.

231311240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37001 (or 36997 counting only the distinct ones).

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

The square root of 231311240 is about 15208.9197512512. The cubic root of 231311240 is about 613.8546908630.

Adding to 231311240 its reverse (42113132), we get a palindrome (273424372).

The spelling of 231311240 in words is "two hundred thirty-one million, three hundred eleven thousand, two hundred forty".