25547 has 4 divisors (see below), whose sum is σ = 26040. Its totient is φ = 25056.

The previous prime is 25541. The next prime is 25561. The reversal of 25547 is 74552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25547 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 5⁵ + 5⁵ + 4⁷ + 7⁴ .

It is a Duffinian number.

It is a nialpdrome in base 13.

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 3 ways as a sum of consecutive naturals, for example, 158 + ... + 275.

It is an arithmetic number, because the mean of its divisors is an integer number (6510).

2²⁵⁵⁴⁷ is an apocalyptic number.

25547 is a deficient number, since it is larger than the sum of its proper divisors (493).

25547 is an equidigital number, since it uses as much as digits as its factorization.

25547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its digits is 1400, while the sum is 23.

The square root of 25547 is about 159.8342891873. The cubic root of 25547 is about 29.4518990131.

The spelling of 25547 in words is "twenty-five thousand, five hundred forty-seven".