86511 has 4 divisors (see below), whose sum is σ = 115352. Its totient is φ = 57672.

The previous prime is 86509. The next prime is 86531. The reversal of 86511 is 11568.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 86511 - 2¹ = 86509 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14416 + ... + 14421.

It is an arithmetic number, because the mean of its divisors is an integer number (28838).

2⁸⁶⁵¹¹ is an apocalyptic number.

86511 is a deficient number, since it is larger than the sum of its proper divisors (28841).

86511 is a wasteful number, since it uses less digits than its factorization.

86511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28840.

The product of its digits is 240, while the sum is 21.

The square root of 86511 is about 294.1275233636. The cubic root of 86511 is about 44.2273017106.

The spelling of 86511 in words is "eighty-six thousand, five hundred eleven".