9819913 has 2 divisors, whose sum is σ = 9819914. Its totient is φ = 9819912.

The previous prime is 9819907. The next prime is 9819947. The reversal of 9819913 is 3199189.

9819913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9653449 + 166464 = 3107^2 + 408^2 .

It is a cyclic number.

It is not a de Polignac number, because 9819913 - 2⁵ = 9819881 is a prime.

It is not a weakly prime, because it can be changed into another prime (9819613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4909956 + 4909957.

It is an arithmetic number, because the mean of its divisors is an integer number (4909957).

Almost surely, 2^9819913 is an apocalyptic number.

It is an amenable number.

9819913 is a deficient number, since it is larger than the sum of its proper divisors (1).

9819913 is an equidigital number, since it uses as much as digits as its factorization.

9819913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 40.

The square root of 9819913 is about 3133.6740417599. The cubic root of 9819913 is about 214.1423413218.

The spelling of 9819913 in words is "nine million, eight hundred nineteen thousand, nine hundred thirteen".