231123140 has 12 divisors (see below), whose sum is σ = 485358636. Its totient is φ = 92449248.

The previous prime is 231123131. The next prime is 231123149. The reversal of 231123140 is 41321132.

It is an interprime number because it is at equal distance from previous prime (231123131) and next prime (231123149).

It can be written as a sum of positive squares in 2 ways, for example, as 38912644 + 192210496 = 6238^2 + 13864^2 .

It is not an unprimeable number, because it can be changed into a prime (231123149) 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 3 ways as a sum of consecutive naturals, for example, 5778059 + ... + 5778098.

It is an arithmetic number, because the mean of its divisors is an integer number (40446553).

Almost surely, 2^231123140 is an apocalyptic number.

231123140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231123140 is an abundant number, since it is smaller than the sum of its proper divisors (254235496).

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

231123140 is a wasteful number, since it uses less digits than its factorization.

231123140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11556166 (or 11556164 counting only the distinct ones).

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

The square root of 231123140 is about 15202.7346224290. The cubic root of 231123140 is about 613.6882522294.

Adding to 231123140 its reverse (41321132), we get a palindrome (272444272).

The spelling of 231123140 in words is "two hundred thirty-one million, one hundred twenty-three thousand, one hundred forty".