86209 has 2 divisors, whose sum is σ = 86210. Its totient is φ = 86208.

The previous prime is 86201. The next prime is 86239. The reversal of 86209 is 90268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51984 + 34225 = 228^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 86209 - 2³ = 86201 is a prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (86201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43104 + 43105.

It is an arithmetic number, because the mean of its divisors is an integer number (43105).

2⁸⁶²⁰⁹ is an apocalyptic number.

It is an amenable number.

86209 is a deficient number, since it is larger than the sum of its proper divisors (1).

86209 is an equidigital number, since it uses as much as digits as its factorization.

86209 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 86209 is about 293.6136917788. The cubic root of 86209 is about 44.1757775595.

The spelling of 86209 in words is "eighty-six thousand, two hundred nine".