9987799229 has 2 divisors, whose sum is σ = 9987799230. Its totient is φ = 9987799228.

The previous prime is 9987799187. The next prime is 9987799231. The reversal of 9987799229 is 9229977899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7136025625 + 2851773604 = 84475^2 + 53402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9987799229 is a prime.

It is a super-2 number, since 2×9987799229² (a number of 21 digits) contains 22 as substring.

Together with 9987799231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9987799429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993899614 + 4993899615.

It is an arithmetic number, because the mean of its divisors is an integer number (4993899615).

Almost surely, 2^9987799229 is an apocalyptic number.

It is an amenable number.

9987799229 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987799229 is an equidigital number, since it uses as much as digits as its factorization.

9987799229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 71.

The square root of 9987799229 is about 99938.9775262885. The cubic root of 9987799229 is about 2153.5581413066.

The spelling of 9987799229 in words is "nine billion, nine hundred eighty-seven million, seven hundred ninety-nine thousand, two hundred twenty-nine".