85845817 has 2 divisors, whose sum is σ = 85845818. Its totient is φ = 85845816.

The previous prime is 85845811. The next prime is 85845839. The reversal of 85845817 is 71854858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43283241 + 42562576 = 6579^2 + 6524^2 .

It is a cyclic number.

It is not a de Polignac number, because 85845817 - 2¹⁹ = 85321529 is a prime.

It is not a weakly prime, because it can be changed into another prime (85845811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42922908 + 42922909.

It is an arithmetic number, because the mean of its divisors is an integer number (42922909).

Almost surely, 2^85845817 is an apocalyptic number.

It is an amenable number.

85845817 is a deficient number, since it is larger than the sum of its proper divisors (1).

85845817 is an equidigital number, since it uses as much as digits as its factorization.

85845817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 358400, while the sum is 46.

The square root of 85845817 is about 9265.3017759812. The cubic root of 85845817 is about 441.1365537466.

The spelling of 85845817 in words is "eighty-five million, eight hundred forty-five thousand, eight hundred seventeen".