86861 has 2 divisors, whose sum is σ = 86862. Its totient is φ = 86860.

The previous prime is 86857. The next prime is 86869. The reversal of 86861 is 16868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75625 + 11236 = 275^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 86861 - 2² = 86857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43430 + 43431.

It is an arithmetic number, because the mean of its divisors is an integer number (43431).

2⁸⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

86861 is a deficient number, since it is larger than the sum of its proper divisors (1).

86861 is an equidigital number, since it uses as much as digits as its factorization.

86861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 86861 is about 294.7219028169. The cubic root of 86861 is about 44.2868653385.

It can be divided in two parts, 868 and 61, that added together give a palindrome (929).

The spelling of 86861 in words is "eighty-six thousand, eight hundred sixty-one".