9871799279 has 2 divisors, whose sum is σ = 9871799280. Its totient is φ = 9871799278.

The previous prime is 9871799263. The next prime is 9871799291. The reversal of 9871799279 is 9729971789.

It is a strong prime.

It is an emirp because it is prime and its reverse (9729971789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9871799279 - 2⁴ = 9871799263 is a prime.

It is a super-5 number, since 5×9871799279⁵ (a number of 51 digits) contains 55555 as substring.

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 (9871799209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4935899639 + 4935899640.

It is an arithmetic number, because the mean of its divisors is an integer number (4935899640).

Almost surely, 2^9871799279 is an apocalyptic number.

9871799279 is a deficient number, since it is larger than the sum of its proper divisors (1).

9871799279 is an equidigital number, since it uses as much as digits as its factorization.

9871799279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36006768, while the sum is 68.

The square root of 9871799279 is about 99356.9286914607. The cubic root of 9871799279 is about 2145.1883946583.

The spelling of 9871799279 in words is "nine billion, eight hundred seventy-one million, seven hundred ninety-nine thousand, two hundred seventy-nine".