24561981 has 16 divisors (see below), whose sum is σ = 36617920. Its totient is φ = 16271280.

The previous prime is 24561961. The next prime is 24561983. The reversal of 24561981 is 18916542.

24561981 is a `hidden beast` number, since 2 + 4 + 561 + 98 + 1 = 666.

It is not a de Polignac number, because 24561981 - 2⁹ = 24561469 is a prime.

It is a super-2 number, since 2×24561981² = 1206581821288722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24561983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1611 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (2288620).

Almost surely, 2^24561981 is an apocalyptic number.

It is an amenable number.

24561981 is a deficient number, since it is larger than the sum of its proper divisors (12055939).

24561981 is a wasteful number, since it uses less digits than its factorization.

24561981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753 (or 5747 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 24561981 is about 4956.0045399495. The cubic root of 24561981 is about 290.6840017565.

It can be divided in two parts, 245 and 61981, that added together give a palindrome (62226).

The spelling of 24561981 in words is "twenty-four million, five hundred sixty-one thousand, nine hundred eighty-one".