25503 has 4 divisors (see below), whose sum is σ = 34008. Its totient is φ = 17000.

The previous prime is 25471. The next prime is 25523. The reversal of 25503 is 30552.

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 25503 - 2⁵ = 25471 is a prime.

It is a D-number.

25503 is a lucky number.

It is a zygodrome in base 2.

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 25503.

It is not an unprimeable number, because it can be changed into a prime (25523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4248 + ... + 4253.

It is an arithmetic number, because the mean of its divisors is an integer number (8502).

2²⁵⁵⁰³ is an apocalyptic number.

25503 is a deficient number, since it is larger than the sum of its proper divisors (8505).

25503 is an equidigital number, since it uses as much as digits as its factorization.

25503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8504.

The product of its (nonzero) digits is 150, while the sum is 15.

The square root of 25503 is about 159.6965873148. The cubic root of 25503 is about 29.4349808069.

It can be divided in two parts, 25 and 503, that added together give a triangular number (528 = T₃₂).

The spelling of 25503 in words is "twenty-five thousand, five hundred three".