209315 has 4 divisors (see below), whose sum is σ = 251184. Its totient is φ = 167448.

The previous prime is 209311. The next prime is 209317. The reversal of 209315 is 513902.

209315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 209315 - 2² = 209311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20927 + ... + 20936.

It is an arithmetic number, because the mean of its divisors is an integer number (62796).

2²⁰⁹³¹⁵ is an apocalyptic number.

209315 is a deficient number, since it is larger than the sum of its proper divisors (41869).

209315 is an equidigital number, since it uses as much as digits as its factorization.

209315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41868.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 209315 is about 457.5095627416. The cubic root of 209315 is about 59.3745207718.

The spelling of 209315 in words is "two hundred nine thousand, three hundred fifteen".