25543 has 8 divisors (see below), whose sum is σ = 30240. Its totient is φ = 21120.

The previous prime is 25541. The next prime is 25561. The reversal of 25543 is 34552.

It is a happy number.

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 25543 - 2^{1} = 25541 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number *n* which added to its sum of digits gives 25543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243 + ... + 331.

It is an arithmetic number, because the mean of its divisors is an integer number (3780).

2^{25543} is an apocalyptic number.

25543 is a deficient number, since it is larger than the sum of its proper divisors (4697).

25543 is an equidigital number, since it uses as much as digits as its factorization.

25543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137.

The product of its digits is 600, while the sum is 19.

The square root of 25543 is about 159.8217757379. The cubic root of 25543 is about 29.4503617974.

Subtracting 25543 from its reverse (34552), we obtain a palindrome (9009).

The spelling of 25543 in words is "twenty-five thousand, five hundred forty-three".

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