86417581 has 2 divisors, whose sum is σ = 86417582. Its totient is φ = 86417580.

The previous prime is 86417557. The next prime is 86417609. The reversal of 86417581 is 18571468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72948681 + 13468900 = 8541^2 + 3670^2 .

It is a cyclic number.

It is not a de Polignac number, because 86417581 - 2⁵ = 86417549 is a prime.

It is a super-2 number, since 2×86417581² = 14935996611783122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86417281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43208790 + 43208791.

It is an arithmetic number, because the mean of its divisors is an integer number (43208791).

Almost surely, 2^86417581 is an apocalyptic number.

It is an amenable number.

86417581 is a deficient number, since it is larger than the sum of its proper divisors (1).

86417581 is an equidigital number, since it uses as much as digits as its factorization.

86417581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 40.

The square root of 86417581 is about 9296.1056900188. The cubic root of 86417581 is about 442.1137634318.

The spelling of 86417581 in words is "eighty-six million, four hundred seventeen thousand, five hundred eighty-one".