261205 has 16 divisors (see below), whose sum is σ = 380160. Its totient is φ = 168192.

The previous prime is 261169. The next prime is 261223. The reversal of 261205 is 502162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261205 - 2⁷ = 261077 is a prime.

It is a congruent number.

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, 376 + ... + 814.

It is an arithmetic number, because the mean of its divisors is an integer number (23760).

2²⁶¹²⁰⁵ is an apocalyptic number.

It is an amenable number.

261205 is a deficient number, since it is larger than the sum of its proper divisors (118955).

261205 is a wasteful number, since it uses less digits than its factorization.

261205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 261205 is about 511.0821851718. The cubic root of 261205 is about 63.9234925616.

Adding to 261205 its reverse (502162), we get a palindrome (763367).

The spelling of 261205 in words is "two hundred sixty-one thousand, two hundred five".