99917009 has 2 divisors, whose sum is σ = 99917010. Its totient is φ = 99917008.

The previous prime is 99916997. The next prime is 99917011. The reversal of 99917009 is 90071999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90307009 + 9610000 = 9503^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 99917009 - 2²⁰ = 98868433 is a prime.

Together with 99917011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99917039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49958504 + 49958505.

It is an arithmetic number, because the mean of its divisors is an integer number (49958505).

Almost surely, 2^99917009 is an apocalyptic number.

It is an amenable number.

99917009 is a deficient number, since it is larger than the sum of its proper divisors (1).

99917009 is an equidigital number, since it uses as much as digits as its factorization.

99917009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 99917009 is about 9995.8495887043. The cubic root of 99917009 is about 464.0304444575.

The spelling of 99917009 in words is "ninety-nine million, nine hundred seventeen thousand, nine".