245543 has 4 divisors (see below), whose sum is σ = 254040. Its totient is φ = 237048.

The previous prime is 245533. The next prime is 245561. The reversal of 245543 is 345542.

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 245543 - 2⁴ = 245527 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 245543.

It is not an unprimeable number, because it can be changed into a prime (245513) 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, 4205 + ... + 4262.

It is an arithmetic number, because the mean of its divisors is an integer number (63510).

2²⁴⁵⁵⁴³ is an apocalyptic number.

245543 is a deficient number, since it is larger than the sum of its proper divisors (8497).

245543 is an equidigital number, since it uses as much as digits as its factorization.

245543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496.

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

The square root of 245543 is about 495.5229560777. The cubic root of 245543 is about 62.6194409298.

Subtracting 245543 from its reverse (345542), we obtain a palindrome (99999).

The spelling of 245543 in words is "two hundred forty-five thousand, five hundred forty-three".