86555221 has 2 divisors, whose sum is σ = 86555222. Its totient is φ = 86555220.

The previous prime is 86555219. The next prime is 86555239. The reversal of 86555221 is 12255568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56415121 + 30140100 = 7511^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 86555221 - 2¹ = 86555219 is a prime.

Together with 86555219, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86555251) 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, 43277610 + 43277611.

It is an arithmetic number, because the mean of its divisors is an integer number (43277611).

Almost surely, 2^86555221 is an apocalyptic number.

It is an amenable number.

86555221 is a deficient number, since it is larger than the sum of its proper divisors (1).

86555221 is an equidigital number, since it uses as much as digits as its factorization.

86555221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 34.

The square root of 86555221 is about 9303.5058445728. The cubic root of 86555221 is about 442.3483617585.

The spelling of 86555221 in words is "eighty-six million, five hundred fifty-five thousand, two hundred twenty-one".