209115 has 16 divisors (see below), whose sum is σ = 372000. Its totient is φ = 111456.

The previous prime is 209089. The next prime is 209123. The reversal of 209115 is 511902.

It is not a de Polignac number, because 209115 - 2¹² = 205019 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640 + ... + 909.

It is an arithmetic number, because the mean of its divisors is an integer number (23250).

2²⁰⁹¹¹⁵ is an apocalyptic number.

209115 is a deficient number, since it is larger than the sum of its proper divisors (162885).

209115 is a wasteful number, since it uses less digits than its factorization.

209115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 209115 is about 457.2909358384. The cubic root of 209115 is about 59.3556040063.

It can be divided in two parts, 209 and 115, that added together give a square (324 = 18²).

The spelling of 209115 in words is "two hundred nine thousand, one hundred fifteen".