99989909 has 2 divisors, whose sum is σ = 99989910. Its totient is φ = 99989908.

The previous prime is 99989891. The next prime is 99989963. The reversal of 99989909 is 90998999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90193009 + 9796900 = 9497^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 99989909 - 2¹⁶ = 99924373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99989009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49994954 + 49994955.

It is an arithmetic number, because the mean of its divisors is an integer number (49994955).

Almost surely, 2^99989909 is an apocalyptic number.

It is an amenable number.

99989909 is a deficient number, since it is larger than the sum of its proper divisors (1).

99989909 is an equidigital number, since it uses as much as digits as its factorization.

99989909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4251528, while the sum is 62.

The square root of 99989909 is about 9999.4954372708. The cubic root of 99989909 is about 464.1432700784.

It can be divided in two parts, 9998990 and 9, that added together give a palindrome (9998999).

The spelling of 99989909 in words is "ninety-nine million, nine hundred eighty-nine thousand, nine hundred nine".