86544217 has 2 divisors, whose sum is σ = 86544218. Its totient is φ = 86544216.

The previous prime is 86544191. The next prime is 86544329. The reversal of 86544217 is 71244568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45212176 + 41332041 = 6724^2 + 6429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86544217 is a prime.

It is a super-2 number, since 2×86544217² = 14979802992286178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86544817) 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, 43272108 + 43272109.

It is an arithmetic number, because the mean of its divisors is an integer number (43272109).

Almost surely, 2^86544217 is an apocalyptic number.

It is an amenable number.

86544217 is a deficient number, since it is larger than the sum of its proper divisors (1).

86544217 is an equidigital number, since it uses as much as digits as its factorization.

86544217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 37.

The square root of 86544217 is about 9302.9144358099. The cubic root of 86544217 is about 442.3296153151.

The spelling of 86544217 in words is "eighty-six million, five hundred forty-four thousand, two hundred seventeen".