209068509 has 8 divisors (see below), whose sum is σ = 300200992. Its totient is φ = 128657520.

The previous prime is 209068493. The next prime is 209068529. The reversal of 209068509 is 905860902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 209068509 - 2⁴ = 209068493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 5360731 = 209068509 / (2 + 0 + 9 + 0 + 6 + 8 + 5 + 0 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209068529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2680327 + ... + 2680404.

It is an arithmetic number, because the mean of its divisors is an integer number (37525124).

Almost surely, 2^209068509 is an apocalyptic number.

It is an amenable number.

209068509 is a deficient number, since it is larger than the sum of its proper divisors (91132483).

209068509 is a wasteful number, since it uses less digits than its factorization.

209068509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360747.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 209068509 is about 14459.2015339714. The cubic root of 209068509 is about 593.5120498194.

The spelling of 209068509 in words is "two hundred nine million, sixty-eight thousand, five hundred nine".