231023140 has 12 divisors (see below), whose sum is σ = 485148636. Its totient is φ = 92409248.

The previous prime is 231023119. The next prime is 231023141. The reversal of 231023140 is 41320132.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 160731684 + 70291456 = 12678^2 + 8384^2 .

It is not an unprimeable number, because it can be changed into a prime (231023141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5775559 + ... + 5775598.

It is an arithmetic number, because the mean of its divisors is an integer number (40429053).

Almost surely, 2^231023140 is an apocalyptic number.

231023140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231023140 is an abundant number, since it is smaller than the sum of its proper divisors (254125496).

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

231023140 is a wasteful number, since it uses less digits than its factorization.

231023140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11551166 (or 11551164 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231023140 is about 15199.4453846185. The cubic root of 231023140 is about 613.5997313394.

Adding to 231023140 its reverse (41320132), we get a palindrome (272343272).

The spelling of 231023140 in words is "two hundred thirty-one million, twenty-three thousand, one hundred forty".