86599561 has 2 divisors, whose sum is σ = 86599562. Its totient is φ = 86599560.

The previous prime is 86599543. The next prime is 86599571. The reversal of 86599561 is 16599568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86490000 + 109561 = 9300^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 86599561 - 2⁵ = 86599529 is a prime.

It is not a weakly prime, because it can be changed into another prime (86599501) 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, 43299780 + 43299781.

It is an arithmetic number, because the mean of its divisors is an integer number (43299781).

Almost surely, 2^86599561 is an apocalyptic number.

It is an amenable number.

86599561 is a deficient number, since it is larger than the sum of its proper divisors (1).

86599561 is an equidigital number, since it uses as much as digits as its factorization.

86599561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 49.

The square root of 86599561 is about 9305.8885121196. Note that the first 3 decimals coincide. The cubic root of 86599561 is about 442.4238834039.

The spelling of 86599561 in words is "eighty-six million, five hundred ninety-nine thousand, five hundred sixty-one".