9918917 has 2 divisors, whose sum is σ = 9918918. Its totient is φ = 9918916.

The previous prime is 9918889. The next prime is 9918941. The reversal of 9918917 is 7198199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9541921 + 376996 = 3089^2 + 614^2 .

It is an emirp because it is prime and its reverse (7198199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9918917 - 2²² = 5724613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9918017) 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, 4959458 + 4959459.

It is an arithmetic number, because the mean of its divisors is an integer number (4959459).

Almost surely, 2^9918917 is an apocalyptic number.

It is an amenable number.

9918917 is a deficient number, since it is larger than the sum of its proper divisors (1).

9918917 is an equidigital number, since it uses as much as digits as its factorization.

9918917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 44.

The square root of 9918917 is about 3149.4312184901. The cubic root of 9918917 is about 214.8595946454.

The spelling of 9918917 in words is "nine million, nine hundred eighteen thousand, nine hundred seventeen".