99859909 has 2 divisors, whose sum is σ = 99859910. Its totient is φ = 99859908.

The previous prime is 99859901. The next prime is 99859927. The reversal of 99859909 is 90995899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67404100 + 32455809 = 8210^2 + 5697^2 .

It is an emirp because it is prime and its reverse (90995899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99859909 - 2³ = 99859901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99859901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49929954 + 49929955.

It is an arithmetic number, because the mean of its divisors is an integer number (49929955).

Almost surely, 2^99859909 is an apocalyptic number.

It is an amenable number.

99859909 is a deficient number, since it is larger than the sum of its proper divisors (1).

99859909 is an equidigital number, since it uses as much as digits as its factorization.

99859909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2361960, while the sum is 58.

The square root of 99859909 is about 9992.9929950941. The cubic root of 99859909 is about 463.9420337937.

The spelling of 99859909 in words is "ninety-nine million, eight hundred fifty-nine thousand, nine hundred nine".