231113140 has 24 divisors (see below), whose sum is σ = 493296552. Its totient is φ = 90929280.

The previous prime is 231113117. The next prime is 231113143. The reversal of 231113140 is 41311132.

It can be written as a sum of positive squares in 4 ways, for example, as 2377764 + 228735376 = 1542^2 + 15124^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231113143) 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 7 ways as a sum of consecutive naturals, for example, 93499 + ... + 95938.

It is an arithmetic number, because the mean of its divisors is an integer number (20554023).

Almost surely, 2^231113140 is an apocalyptic number.

231113140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231113140 is an abundant number, since it is smaller than the sum of its proper divisors (262183412).

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

231113140 is a wasteful number, since it uses less digits than its factorization.

231113140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189507 (or 189505 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 231113140 is about 15202.4057306730. The cubic root of 231113140 is about 613.6794012896.

Adding to 231113140 its reverse (41311132), we get a palindrome (272424272).

It can be divided in two parts, 2311 and 13140, that added together give a palindrome (15451).

The spelling of 231113140 in words is "two hundred thirty-one million, one hundred thirteen thousand, one hundred forty".