265543 has 2 divisors, whose sum is σ = 265544. Its totient is φ = 265542.

The previous prime is 265541. The next prime is 265547. The reversal of 265543 is 345562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265543 - 2¹ = 265541 is a prime.

Together with 265541, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2⁵ + 6² + 5³ + 5⁵ + 4⁹ + 3⁴ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132771 + 132772.

It is an arithmetic number, because the mean of its divisors is an integer number (132772).

2²⁶⁵⁵⁴³ is an apocalyptic number.

265543 is a deficient number, since it is larger than the sum of its proper divisors (1).

265543 is an equidigital number, since it uses as much as digits as its factorization.

265543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 25.

The square root of 265543 is about 515.3086453767. The cubic root of 265543 is about 64.2754243377.

It can be divided in two parts, 265 and 543, that added together give a palindrome (808).

The spelling of 265543 in words is "two hundred sixty-five thousand, five hundred forty-three".