9917279 has 2 divisors, whose sum is σ = 9917280. Its totient is φ = 9917278.

The previous prime is 9917267. The next prime is 9917287. The reversal of 9917279 is 9727199.

It is a strong prime.

It is an emirp because it is prime and its reverse (9727199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9917279 - 2⁴ = 9917263 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9917249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958639 + 4958640.

It is an arithmetic number, because the mean of its divisors is an integer number (4958640).

Almost surely, 2^9917279 is an apocalyptic number.

9917279 is a deficient number, since it is larger than the sum of its proper divisors (1).

9917279 is an equidigital number, since it uses as much as digits as its factorization.

9917279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 44.

The square root of 9917279 is about 3149.1711607977. The cubic root of 9917279 is about 214.8477667617.

The spelling of 9917279 in words is "nine million, nine hundred seventeen thousand, two hundred seventy-nine".