9999100009 has 2 divisors, whose sum is σ = 9999100010. Its totient is φ = 9999100008.

The previous prime is 9999099991. The next prime is 9999100051. The reversal of 9999100009 is 9000019999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9409970025 + 589129984 = 97005^2 + 24272^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999100009 - 2⁵ = 9999099977 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999100079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999550004 + 4999550005.

It is an arithmetic number, because the mean of its divisors is an integer number (4999550005).

Almost surely, 2^9999100009 is an apocalyptic number.

It is an amenable number.

9999100009 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999100009 is an equidigital number, since it uses as much as digits as its factorization.

9999100009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59049, while the sum is 46.

The square root of 9999100009 is about 99995.4999437475. The cubic root of 9999100009 is about 2154.3700556985.

The spelling of 9999100009 in words is "nine billion, nine hundred ninety-nine million, one hundred thousand, nine".