24409981 has 4 divisors (see below), whose sum is σ = 24436192. Its totient is φ = 24383772.

The previous prime is 24409963. The next prime is 24409993. The reversal of 24409981 is 18990442.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18990442 = 2 ⋅9495221.

It is a cyclic number.

It is not a de Polignac number, because 24409981 - 2⁵ = 24409949 is a prime.

It is a super-2 number, since 2×24409981² = 1191694344840722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 24409981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24409961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11655 + ... + 13588.

It is an arithmetic number, because the mean of its divisors is an integer number (6109048).

Almost surely, 2^24409981 is an apocalyptic number.

It is an amenable number.

24409981 is a deficient number, since it is larger than the sum of its proper divisors (26211).

24409981 is an equidigital number, since it uses as much as digits as its factorization.

24409981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26210.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 24409981 is about 4940.6458079891. The cubic root of 24409981 is about 290.0831351029.

It can be divided in two parts, 2440 and 9981, that added together give a palindrome (12421).

The spelling of 24409981 in words is "twenty-four million, four hundred nine thousand, nine hundred eighty-one".