85807817 has 2 divisors, whose sum is σ = 85807818. Its totient is φ = 85807816.

The previous prime is 85807769. The next prime is 85807829. The reversal of 85807817 is 71870858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65593801 + 20214016 = 8099^2 + 4496^2 .

It is a cyclic number.

It is not a de Polignac number, because 85807817 - 2⁶ = 85807753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85807867) 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, 42903908 + 42903909.

It is an arithmetic number, because the mean of its divisors is an integer number (42903909).

Almost surely, 2^85807817 is an apocalyptic number.

It is an amenable number.

85807817 is a deficient number, since it is larger than the sum of its proper divisors (1).

85807817 is an equidigital number, since it uses as much as digits as its factorization.

85807817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 85807817 is about 9263.2508872426. The cubic root of 85807817 is about 441.0714538436.

The spelling of 85807817 in words is "eighty-five million, eight hundred seven thousand, eight hundred seventeen".