86205409 has 2 divisors, whose sum is σ = 86205410. Its totient is φ = 86205408.

The previous prime is 86205391. The next prime is 86205433. The reversal of 86205409 is 90450268.

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., 79299025 + 6906384 = 8905^2 + 2628^2 .

It is a cyclic number.

It is not a de Polignac number, because 86205409 - 2¹⁹ = 85681121 is a prime.

It is not a weakly prime, because it can be changed into another prime (86205439) 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, 43102704 + 43102705.

It is an arithmetic number, because the mean of its divisors is an integer number (43102705).

Almost surely, 2^86205409 is an apocalyptic number.

It is an amenable number.

86205409 is a deficient number, since it is larger than the sum of its proper divisors (1).

86205409 is an equidigital number, since it uses as much as digits as its factorization.

86205409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 86205409 is about 9284.6868013951. The cubic root of 86205409 is about 441.7516417648.

The spelling of 86205409 in words is "eighty-six million, two hundred five thousand, four hundred nine".