9721849 has 2 divisors, whose sum is σ = 9721850. Its totient is φ = 9721848.

The previous prime is 9721837. The next prime is 9721853. The reversal of 9721849 is 9481279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9241600 + 480249 = 3040^2 + 693^2 .

It is an emirp because it is prime and its reverse (9481279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9721849 - 2⁷ = 9721721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9751849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860924 + 4860925.

It is an arithmetic number, because the mean of its divisors is an integer number (4860925).

Almost surely, 2^9721849 is an apocalyptic number.

It is an amenable number.

9721849 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721849 is an equidigital number, since it uses as much as digits as its factorization.

9721849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 9721849 is about 3117.9879730365. The cubic root of 9721849 is about 213.4271297071.

The spelling of 9721849 in words is "nine million, seven hundred twenty-one thousand, eight hundred forty-nine".