86187221 has 2 divisors, whose sum is σ = 86187222. Its totient is φ = 86187220.

The previous prime is 86187203. The next prime is 86187271. The reversal of 86187221 is 12278168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85359121 + 828100 = 9239^2 + 910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86187221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86187271) 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, 43093610 + 43093611.

It is an arithmetic number, because the mean of its divisors is an integer number (43093611).

Almost surely, 2^86187221 is an apocalyptic number.

It is an amenable number.

86187221 is a deficient number, since it is larger than the sum of its proper divisors (1).

86187221 is an equidigital number, since it uses as much as digits as its factorization.

86187221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 35.

The square root of 86187221 is about 9283.7072875010. The cubic root of 86187221 is about 441.7205720053.

The spelling of 86187221 in words is "eighty-six million, one hundred eighty-seven thousand, two hundred twenty-one".