24545 has 4 divisors (see below), whose sum is σ = 29460. Its totient is φ = 19632.

The previous prime is 24533. The next prime is 24547. The reversal of 24545 is 54542.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54542 = 2 ⋅27271.

It can be written as a sum of positive squares in 2 ways, for example, as 18769 + 5776 = 137^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 24545 - 2⁶ = 24481 is a prime.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (24547) 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, 2450 + ... + 2459.

It is an arithmetic number, because the mean of its divisors is an integer number (7365).

2²⁴⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

24545 is a deficient number, since it is larger than the sum of its proper divisors (4915).

24545 is an equidigital number, since it uses as much as digits as its factorization.

24545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4914.

The product of its digits is 800, while the sum is 20.

The square root of 24545 is about 156.6684397063. The cubic root of 24545 is about 29.0616997891.

It can be divided in two parts, 245 and 45, that multiplied together give a square (11025 = 105²).

The spelling of 24545 in words is "twenty-four thousand, five hundred forty-five".