99679009 has 2 divisors, whose sum is σ = 99679010. Its totient is φ = 99679008.

The previous prime is 99679001. The next prime is 99679037. The reversal of 99679009 is 90097699.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67699984 + 31979025 = 8228^2 + 5655^2 .

It is an emirp because it is prime and its reverse (90097699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99679009 - 2³ = 99679001 is a prime.

It is not a weakly prime, because it can be changed into another prime (99679001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49839504 + 49839505.

It is an arithmetic number, because the mean of its divisors is an integer number (49839505).

Almost surely, 2^99679009 is an apocalyptic number.

It is an amenable number.

99679009 is a deficient number, since it is larger than the sum of its proper divisors (1).

99679009 is an equidigital number, since it uses as much as digits as its factorization.

99679009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 99679009 is about 9983.9375498848. The cubic root of 99679009 is about 463.6617149455.

The spelling of 99679009 in words is "ninety-nine million, six hundred seventy-nine thousand, nine".