9919849 has 2 divisors, whose sum is σ = 9919850. Its totient is φ = 9919848.

The previous prime is 9919841. The next prime is 9919853. The reversal of 9919849 is 9489199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 1364224 = 2925^2 + 1168^2 .

It is an emirp because it is prime and its reverse (9489199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9919849 - 2³ = 9919841 is a prime.

It is not a weakly prime, because it can be changed into another prime (9919841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959924 + 4959925.

It is an arithmetic number, because the mean of its divisors is an integer number (4959925).

Almost surely, 2^9919849 is an apocalyptic number.

It is an amenable number.

9919849 is a deficient number, since it is larger than the sum of its proper divisors (1).

9919849 is an equidigital number, since it uses as much as digits as its factorization.

9919849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 49.

The square root of 9919849 is about 3149.5791782395. The cubic root of 9919849 is about 214.8663239712.

The spelling of 9919849 in words is "nine million, nine hundred nineteen thousand, eight hundred forty-nine".