9921249 has 24 divisors (see below), whose sum is σ = 16248960. Its totient is φ = 5782752.

The previous prime is 9921227. The next prime is 9921259. The reversal of 9921249 is 9421299.

9921249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9921249 - 2⁸ = 9920993 is a prime.

It is a Curzon number.

9921249 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9921259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9 + ... + 4454.

It is an arithmetic number, because the mean of its divisors is an integer number (677040).

Almost surely, 2^9921249 is an apocalyptic number.

It is an amenable number.

9921249 is a deficient number, since it is larger than the sum of its proper divisors (6327711).

9921249 is a wasteful number, since it uses less digits than its factorization.

9921249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501 (or 4498 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 9921249 is about 3149.8014223122. The cubic root of 9921249 is about 214.8764316083.

Adding to 9921249 its sum of digits (36), we get a triangular number (9921285 = T₄₄₅₄).

The spelling of 9921249 in words is "nine million, nine hundred twenty-one thousand, two hundred forty-nine".