209095009 has 2 divisors, whose sum is σ = 209095010. Its totient is φ = 209095008.

The previous prime is 209094989. The next prime is 209095049. The reversal of 209095009 is 900590902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206928225 + 2166784 = 14385^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 209095009 - 2⁹ = 209094497 is a prime.

It is not a weakly prime, because it can be changed into another prime (209095049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104547504 + 104547505.

It is an arithmetic number, because the mean of its divisors is an integer number (104547505).

Almost surely, 2^209095009 is an apocalyptic number.

It is an amenable number.

209095009 is a deficient number, since it is larger than the sum of its proper divisors (1).

209095009 is an equidigital number, since it uses as much as digits as its factorization.

209095009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 209095009 is about 14460.1178764213. The cubic root of 209095009 is about 593.5371251801.

The spelling of 209095009 in words is "two hundred nine million, ninety-five thousand, nine".