86805221 has 2 divisors, whose sum is σ = 86805222. Its totient is φ = 86805220.

The previous prime is 86805211. The next prime is 86805223. The reversal of 86805221 is 12250868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 5354596 = 9025^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 86805221 - 2¹⁰ = 86804197 is a prime.

Together with 86805223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86805223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43402610 + 43402611.

It is an arithmetic number, because the mean of its divisors is an integer number (43402611).

Almost surely, 2^86805221 is an apocalyptic number.

It is an amenable number.

86805221 is a deficient number, since it is larger than the sum of its proper divisors (1).

86805221 is an equidigital number, since it uses as much as digits as its factorization.

86805221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 86805221 is about 9316.9319520967. The cubic root of 86805221 is about 442.7738349960.

The spelling of 86805221 in words is "eighty-six million, eight hundred five thousand, two hundred twenty-one".