209245 has 4 divisors (see below), whose sum is σ = 251100. Its totient is φ = 167392.

The previous prime is 209233. The next prime is 209249. The reversal of 209245 is 542902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542902 = 2 ⋅271451.

It can be written as a sum of positive squares in 2 ways, for example, as 127449 + 81796 = 357^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 209245 - 2⁵ = 209213 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209249) 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, 20920 + ... + 20929.

It is an arithmetic number, because the mean of its divisors is an integer number (62775).

2²⁰⁹²⁴⁵ is an apocalyptic number.

It is an amenable number.

209245 is a deficient number, since it is larger than the sum of its proper divisors (41855).

209245 is an equidigital number, since it uses as much as digits as its factorization.

209245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41854.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 209245 is about 457.4330552114. The cubic root of 209245 is about 59.3679012751.

It can be divided in two parts, 209 and 245, that added together give a palindrome (454).

The spelling of 209245 in words is "two hundred nine thousand, two hundred forty-five".