260809 has 2 divisors, whose sum is σ = 260810. Its totient is φ = 260808.

The previous prime is 260807. The next prime is 260849. The reversal of 260809 is 908062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222784 + 38025 = 472^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 260809 - 2¹ = 260807 is a prime.

Together with 260807, it forms a pair of twin primes.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (260807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130404 + 130405.

It is an arithmetic number, because the mean of its divisors is an integer number (130405).

2²⁶⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

260809 is a deficient number, since it is larger than the sum of its proper divisors (1).

260809 is an equidigital number, since it uses as much as digits as its factorization.

260809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 260809 is about 510.6946249962. The cubic root of 260809 is about 63.8911724732.

The spelling of 260809 in words is "two hundred sixty thousand, eight hundred nine".