231144140 has 12 divisors (see below), whose sum is σ = 485402736. Its totient is φ = 92457648.

The previous prime is 231144131. The next prime is 231144157. The reversal of 231144140 is 41441132.

It is a super-2 number, since 2×231144140² = 106855226912679200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 11557207 = 231144140 / (2 + 3 + 1 + 1 + 4 + 4 + 1 + 4 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5778584 + ... + 5778623.

It is an arithmetic number, because the mean of its divisors is an integer number (40450228).

Almost surely, 2^231144140 is an apocalyptic number.

231144140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231144140 is an abundant number, since it is smaller than the sum of its proper divisors (254258596).

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

231144140 is a wasteful number, since it uses less digits than its factorization.

231144140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11557216 (or 11557214 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 231144140 is about 15203.4252719576. The cubic root of 231144140 is about 613.7068383721.

Adding to 231144140 its reverse (41441132), we get a palindrome (272585272).

The spelling of 231144140 in words is "two hundred thirty-one million, one hundred forty-four thousand, one hundred forty".