85840717 has 2 divisors, whose sum is σ = 85840718. Its totient is φ = 85840716.

The previous prime is 85840709. The next prime is 85840721. The reversal of 85840717 is 71704858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70324996 + 15515721 = 8386^2 + 3939^2 .

It is a cyclic number.

It is not a de Polignac number, because 85840717 - 2³ = 85840709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85840717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85840787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42920358 + 42920359.

It is an arithmetic number, because the mean of its divisors is an integer number (42920359).

Almost surely, 2^85840717 is an apocalyptic number.

It is an amenable number.

85840717 is a deficient number, since it is larger than the sum of its proper divisors (1).

85840717 is an equidigital number, since it uses as much as digits as its factorization.

85840717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 85840717 is about 9265.0265515000. The cubic root of 85840717 is about 441.1278177706.

The spelling of 85840717 in words is "eighty-five million, eight hundred forty thousand, seven hundred seventeen".