86609 has 4 divisors (see below), whose sum is σ = 87204. Its totient is φ = 86016.

The previous prime is 86599. The next prime is 86627. The reversal of 86609 is 90668.

86609 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 61009 + 25600 = 247^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 86609 - 2⁸ = 86353 is a prime.

It is a super-2 number, since 2×86609² = 15002237762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89 + ... + 425.

It is an arithmetic number, because the mean of its divisors is an integer number (21801).

2⁸⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

86609 is a deficient number, since it is larger than the sum of its proper divisors (595).

86609 is a wasteful number, since it uses less digits than its factorization.

86609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 86609 is about 294.2940706164. The cubic root of 86609 is about 44.2439956955.

The spelling of 86609 in words is "eighty-six thousand, six hundred nine".