9921449 has 2 divisors, whose sum is σ = 9921450. Its totient is φ = 9921448.

The previous prime is 9921409. The next prime is 9921473. The reversal of 9921449 is 9441299.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5221225 + 4700224 = 2285^2 + 2168^2 .

It is a cyclic number.

It is not a de Polignac number, because 9921449 - 2⁸ = 9921193 is a prime.

It is not a weakly prime, because it can be changed into another prime (9921409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960724 + 4960725.

It is an arithmetic number, because the mean of its divisors is an integer number (4960725).

Almost surely, 2^9921449 is an apocalyptic number.

It is an amenable number.

9921449 is a deficient number, since it is larger than the sum of its proper divisors (1).

9921449 is an equidigital number, since it uses as much as digits as its factorization.

9921449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 9921449 is about 3149.8331701854. The cubic root of 9921449 is about 214.8778754789.

The spelling of 9921449 in words is "nine million, nine hundred twenty-one thousand, four hundred forty-nine".