86805217 has 4 divisors (see below), whose sum is σ = 86853060. Its totient is φ = 86757376.

The previous prime is 86805211. The next prime is 86805221. The reversal of 86805217 is 71250868.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33281361 + 53523856 = 5769^2 + 7316^2 .

It is a cyclic number.

It is not a de Polignac number, because 86805217 - 2¹¹ = 86803169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86805211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21088 + ... + 24865.

It is an arithmetic number, because the mean of its divisors is an integer number (21713265).

Almost surely, 2^86805217 is an apocalyptic number.

It is an amenable number.

86805217 is a deficient number, since it is larger than the sum of its proper divisors (47843).

86805217 is a wasteful number, since it uses less digits than its factorization.

86805217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47842.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 86805217 is about 9316.9317374337. The cubic root of 86805217 is about 442.7738281950.

The spelling of 86805217 in words is "eighty-six million, eight hundred five thousand, two hundred seventeen".