9997913 has 2 divisors, whose sum is σ = 9997914. Its totient is φ = 9997912.

The previous prime is 9997879. The next prime is 9997927. The reversal of 9997913 is 3197999.

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., 9467929 + 529984 = 3077^2 + 728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997913 is a prime.

It is not a weakly prime, because it can be changed into another prime (9997613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998956 + 4998957.

It is an arithmetic number, because the mean of its divisors is an integer number (4998957).

Almost surely, 2^9997913 is an apocalyptic number.

It is an amenable number.

9997913 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997913 is an equidigital number, since it uses as much as digits as its factorization.

9997913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137781, while the sum is 47.

The square root of 9997913 is about 3161.9476592758. The cubic root of 9997913 is about 215.4284802764.

The spelling of 9997913 in words is "nine million, nine hundred ninety-seven thousand, nine hundred thirteen".