260861 has 2 divisors, whose sum is σ = 260862. Its totient is φ = 260860.

The previous prime is 260857. The next prime is 260863. The reversal of 260861 is 168062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155236 + 105625 = 394^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 260861 - 2² = 260857 is a prime.

It is a super-2 number, since 2×260861² = 136096922642, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 260863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130430 + 130431.

It is an arithmetic number, because the mean of its divisors is an integer number (130431).

2²⁶⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

260861 is a deficient number, since it is larger than the sum of its proper divisors (1).

260861 is an equidigital number, since it uses as much as digits as its factorization.

260861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 260861 is about 510.7455335096. The cubic root of 260861 is about 63.8954183903.

The spelling of 260861 in words is "two hundred sixty thousand, eight hundred sixty-one".