243057 has 4 divisors (see below), whose sum is σ = 324080. Its totient is φ = 162036.

The previous prime is 243031. The next prime is 243073. The reversal of 243057 is 750342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-243057 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243057.

It is not an unprimeable number, because it can be changed into a prime (243077) 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, 40507 + ... + 40512.

It is an arithmetic number, because the mean of its divisors is an integer number (81020).

2²⁴³⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

243057 is a deficient number, since it is larger than the sum of its proper divisors (81023).

243057 is an equidigital number, since it uses as much as digits as its factorization.

243057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81022.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 243057 is about 493.0081135235. The cubic root of 243057 is about 62.4073935191.

Adding to 243057 its reverse (750342), we get a palindrome (993399).

It can be divided in two parts, 24 and 3057, that added together give a triangular number (3081 = T₇₈).

The spelling of 243057 in words is "two hundred forty-three thousand, fifty-seven".