86866217 has 2 divisors, whose sum is σ = 86866218. Its totient is φ = 86866216.

The previous prime is 86866207. The next prime is 86866229. The reversal of 86866217 is 71266868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49056016 + 37810201 = 7004^2 + 6149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86866217 is a prime.

It is not a weakly prime, because it can be changed into another prime (86866207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43433108 + 43433109.

It is an arithmetic number, because the mean of its divisors is an integer number (43433109).

Almost surely, 2^86866217 is an apocalyptic number.

It is an amenable number.

86866217 is a deficient number, since it is larger than the sum of its proper divisors (1).

86866217 is an equidigital number, since it uses as much as digits as its factorization.

86866217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 86866217 is about 9320.2047724286. The cubic root of 86866217 is about 442.8775196560.

The spelling of 86866217 in words is "eighty-six million, eight hundred sixty-six thousand, two hundred seventeen".