243545 has 8 divisors (see below), whose sum is σ = 297024. Its totient is φ = 191664.

The previous prime is 243539. The next prime is 243553. The reversal of 243545 is 545342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243545 - 2¹⁰ = 242521 is a prime.

It is a super-3 number, since 3×243545³ = 43337006424310875, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243545.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29 + ... + 698.

It is an arithmetic number, because the mean of its divisors is an integer number (37128).

2²⁴³⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

243545 is a deficient number, since it is larger than the sum of its proper divisors (53479).

243545 is an equidigital number, since it uses as much as digits as its factorization.

243545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799.

The product of its digits is 2400, while the sum is 23.

The square root of 243545 is about 493.5027862130. The cubic root of 243545 is about 62.4491319436.

Adding to 243545 its reverse (545342), we get a palindrome (788887).

The spelling of 243545 in words is "two hundred forty-three thousand, five hundred forty-five".