24491 has 4 divisors (see below), whose sum is σ = 25800. Its totient is φ = 23184.

The previous prime is 24481. The next prime is 24499. The reversal of 24491 is 19442.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19442 = 2 ⋅9721.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626 + ... + 663.

It is an arithmetic number, because the mean of its divisors is an integer number (6450).

2²⁴⁴⁹¹ is an apocalyptic number.

24491 is a deficient number, since it is larger than the sum of its proper divisors (1309).

24491 is a wasteful number, since it uses less digits than its factorization.

24491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its digits is 288, while the sum is 20.

The square root of 24491 is about 156.4960063388. The cubic root of 24491 is about 29.0403718328.

It can be divided in two parts, 24 and 491, that added together give a palindrome (515).

The spelling of 24491 in words is "twenty-four thousand, four hundred ninety-one".