260209 has 2 divisors, whose sum is σ = 260210. Its totient is φ = 260208.

The previous prime is 260207. The next prime is 260213. The reversal of 260209 is 902062.

260209 = T₄₁₅ + T₄₁₆ + T₄₁₇.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255025 + 5184 = 505^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 260209 - 2¹ = 260207 is a prime.

Together with 260207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (260201) 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 as a sum of consecutive naturals, namely, 130104 + 130105.

It is an arithmetic number, because the mean of its divisors is an integer number (130105).

2²⁶⁰²⁰⁹ is an apocalyptic number.

260209 is the 417-th centered triangular number.

It is an amenable number.

260209 is a deficient number, since it is larger than the sum of its proper divisors (1).

260209 is an equidigital number, since it uses as much as digits as its factorization.

260209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 260209 is about 510.1068515517. The cubic root of 260209 is about 63.8421402467.

The spelling of 260209 in words is "two hundred sixty thousand, two hundred nine".