231142243 has 4 divisors (see below), whose sum is σ = 236517688. Its totient is φ = 225766800.

The previous prime is 231142213. The next prime is 231142259. The reversal of 231142243 is 342241132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231142243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231142213) by changing a digit.

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, 2687658 + ... + 2687743.

It is an arithmetic number, because the mean of its divisors is an integer number (59129422).

Almost surely, 2^231142243 is an apocalyptic number.

231142243 is a deficient number, since it is larger than the sum of its proper divisors (5375445).

231142243 is an equidigital number, since it uses as much as digits as its factorization.

231142243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5375444.

The product of its digits is 1152, while the sum is 22.

The square root of 231142243 is about 15203.3628845726. The cubic root of 231142243 is about 613.7051594702.

Adding to 231142243 its reverse (342241132), we get a palindrome (573383375).

The spelling of 231142243 in words is "two hundred thirty-one million, one hundred forty-two thousand, two hundred forty-three".