9905109869 has 2 divisors, whose sum is σ = 9905109870. Its totient is φ = 9905109868.

The previous prime is 9905109853. The next prime is 9905109871. The reversal of 9905109869 is 9689015099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8111163844 + 1793946025 = 90062^2 + 42355^2 .

It is an emirp because it is prime and its reverse (9689015099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9905109869 - 2⁴ = 9905109853 is a prime.

It is a super-2 number, since 2×9905109869² (a number of 21 digits) contains 22 as substring.

Together with 9905109871, 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 (9905109829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4952554934 + 4952554935.

It is an arithmetic number, because the mean of its divisors is an integer number (4952554935).

Almost surely, 2^9905109869 is an apocalyptic number.

It is an amenable number.

9905109869 is a deficient number, since it is larger than the sum of its proper divisors (1).

9905109869 is an equidigital number, since it uses as much as digits as its factorization.

9905109869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1574640, while the sum is 56.

The square root of 9905109869 is about 99524.4184559749. The cubic root of 9905109869 is about 2147.5985350988.

The spelling of 9905109869 in words is "nine billion, nine hundred five million, one hundred nine thousand, eight hundred sixty-nine".