242543 has 4 divisors (see below), whose sum is σ = 277200. Its totient is φ = 207888.

The previous prime is 242533. The next prime is 242551. The reversal of 242543 is 345242.

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

It is a cyclic number.

It is not a de Polignac number, because 242543 - 2⁶ = 242479 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242533) 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, 17318 + ... + 17331.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2²⁴²⁵⁴³ is an apocalyptic number.

242543 is a deficient number, since it is larger than the sum of its proper divisors (34657).

242543 is an equidigital number, since it uses as much as digits as its factorization.

242543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34656.

The product of its digits is 960, while the sum is 20.

The square root of 242543 is about 492.4865480396. The cubic root of 242543 is about 62.3633708707.

Adding to 242543 its reverse (345242), we get a palindrome (587785).

The spelling of 242543 in words is "two hundred forty-two thousand, five hundred forty-three".