209215 has 4 divisors (see below), whose sum is σ = 251064. Its totient is φ = 167368.

The previous prime is 209213. The next prime is 209221. The reversal of 209215 is 512902.

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 209215 - 2¹ = 209213 is a prime.

It is a d-powerful number, because it can be written as 2³ + 0 + 2¹⁷ + 9 + 1 + 5⁷ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209192 and 209201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20917 + ... + 20926.

It is an arithmetic number, because the mean of its divisors is an integer number (62766).

2²⁰⁹²¹⁵ is an apocalyptic number.

209215 is a deficient number, since it is larger than the sum of its proper divisors (41849).

209215 is an equidigital number, since it uses as much as digits as its factorization.

209215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41848.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 209215 is about 457.4002623524. The cubic root of 209215 is about 59.3650638960.

It can be divided in two parts, 209 and 215, that added together give a palindrome (424).

The spelling of 209215 in words is "two hundred nine thousand, two hundred fifteen".