86505641 has 2 divisors, whose sum is σ = 86505642. Its totient is φ = 86505640.

The previous prime is 86505611. The next prime is 86505701. The reversal of 86505641 is 14650568.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 17682025 = 8296^2 + 4205^2 .

It is a cyclic number.

It is not a de Polignac number, because 86505641 - 2¹⁰ = 86504617 is a prime.

It is a super-4 number, since 4×86505641⁴ (a number of 33 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (86505611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43252820 + 43252821.

It is an arithmetic number, because the mean of its divisors is an integer number (43252821).

Almost surely, 2^86505641 is an apocalyptic number.

It is an amenable number.

86505641 is a deficient number, since it is larger than the sum of its proper divisors (1).

86505641 is an equidigital number, since it uses as much as digits as its factorization.

86505641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 86505641 is about 9300.8408759639. The cubic root of 86505641 is about 442.2638845873.

The spelling of 86505641 in words is "eighty-six million, five hundred five thousand, six hundred forty-one".