25481 has 4 divisors (see below), whose sum is σ = 25872. Its totient is φ = 25092.

The previous prime is 25471. The next prime is 25523. The reversal of 25481 is 18452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25481 is a prime.

It is a super-2 number, since 2×25481² = 1298562722, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25481.

It is not an unprimeable number, because it can be changed into a prime (25411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71 + ... + 236.

It is an arithmetic number, because the mean of its divisors is an integer number (6468).

2²⁵⁴⁸¹ is an apocalyptic number.

It is an amenable number.

25481 is a deficient number, since it is larger than the sum of its proper divisors (391).

25481 is an equidigital number, since it uses as much as digits as its factorization.

25481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390.

The product of its digits is 320, while the sum is 20.

The square root of 25481 is about 159.6276918332. The cubic root of 25481 is about 29.4265144059.

The spelling of 25481 in words is "twenty-five thousand, four hundred eighty-one".