9999280217 has 2 divisors, whose sum is σ = 9999280218. Its totient is φ = 9999280216.

The previous prime is 9999280189. The next prime is 9999280241. The reversal of 9999280217 is 7120829999.

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., 9986204761 + 13075456 = 99931^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999280217 - 2¹⁶ = 9999214681 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999280297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999640108 + 4999640109.

It is an arithmetic number, because the mean of its divisors is an integer number (4999640109).

Almost surely, 2^9999280217 is an apocalyptic number.

It is an amenable number.

9999280217 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999280217 is an equidigital number, since it uses as much as digits as its factorization.

9999280217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 9999280217 is about 99996.4010202367. The cubic root of 9999280217 is about 2154.3829979428.

The spelling of 9999280217 in words is "nine billion, nine hundred ninety-nine million, two hundred eighty thousand, two hundred seventeen".