9009197809 has 2 divisors, whose sum is σ = 9009197810. Its totient is φ = 9009197808.

The previous prime is 9009197783. The next prime is 9009197851. The reversal of 9009197809 is 9087919009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7691290000 + 1317907809 = 87700^2 + 36303^2 .

It is a cyclic number.

It is not a de Polignac number, because 9009197809 - 2⁹ = 9009197297 is a prime.

It is not a weakly prime, because it can be changed into another prime (9009195809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4504598904 + 4504598905.

It is an arithmetic number, because the mean of its divisors is an integer number (4504598905).

Almost surely, 2^9009197809 is an apocalyptic number.

It is an amenable number.

9009197809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9009197809 is an equidigital number, since it uses as much as digits as its factorization.

9009197809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 9009197809 is about 94916.7941357060. The cubic root of 9009197809 is about 2080.7921823050.

The spelling of 9009197809 in words is "nine billion, nine million, one hundred ninety-seven thousand, eight hundred nine".