9949909 has 2 divisors, whose sum is σ = 9949910. Its totient is φ = 9949908.

The previous prime is 9949889. The next prime is 9949931. The reversal of 9949909 is 9099499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5391684 + 4558225 = 2322^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 9949909 - 2¹³ = 9941717 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9149909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4974954 + 4974955.

It is an arithmetic number, because the mean of its divisors is an integer number (4974955).

Almost surely, 2^9949909 is an apocalyptic number.

It is an amenable number.

9949909 is a deficient number, since it is larger than the sum of its proper divisors (1).

9949909 is an equidigital number, since it uses as much as digits as its factorization.

9949909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 9949909 is about 3154.3476346148. The cubic root of 9949909 is about 215.0831407315.

The spelling of 9949909 in words is "nine million, nine hundred forty-nine thousand, nine hundred nine".