26861 has 2 divisors, whose sum is σ = 26862. Its totient is φ = 26860.

The previous prime is 26849. The next prime is 26863. The reversal of 26861 is 16862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15625 + 11236 = 125^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 26861 - 2¹⁴ = 10477 is a prime.

Together with 26863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13430 + 13431.

It is an arithmetic number, because the mean of its divisors is an integer number (13431).

2²⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

26861 is a deficient number, since it is larger than the sum of its proper divisors (1).

26861 is an equidigital number, since it uses as much as digits as its factorization.

26861 is an odious number, because the sum of its binary digits is odd.

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

The square root of 26861 is about 163.8932579455. The cubic root of 26861 is about 29.9484299202.

Subtracting from 26861 its reverse (16862), we obtain a palindrome (9999).

The spelling of 26861 in words is "twenty-six thousand, eight hundred sixty-one".