24861 has 4 divisors (see below), whose sum is σ = 33152. Its totient is φ = 16572.

The previous prime is 24859. The next prime is 24877. The reversal of 24861 is 16842.

24861 is nontrivially palindromic in base 5.

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 not a de Polignac number, because 24861 - 2¹ = 24859 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24821) 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, 4141 + ... + 4146.

It is an arithmetic number, because the mean of its divisors is an integer number (8288).

2²⁴⁸⁶¹ is an apocalyptic number.

It is an amenable number.

24861 is a deficient number, since it is larger than the sum of its proper divisors (8291).

24861 is an equidigital number, since it uses as much as digits as its factorization.

24861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8290.

The product of its digits is 384, while the sum is 21.

The square root of 24861 is about 157.6737137255. The cubic root of 24861 is about 29.1858848399.

The spelling of 24861 in words is "twenty-four thousand, eight hundred sixty-one".