85717217 has 2 divisors, whose sum is σ = 85717218. Its totient is φ = 85717216.

The previous prime is 85717199. The next prime is 85717267. The reversal of 85717217 is 71271758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 43681 = 9256^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 85717217 - 2²⁰ = 84668641 is a prime.

It is not a weakly prime, because it can be changed into another prime (85717267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42858608 + 42858609.

It is an arithmetic number, because the mean of its divisors is an integer number (42858609).

Almost surely, 2^85717217 is an apocalyptic number.

It is an amenable number.

85717217 is a deficient number, since it is larger than the sum of its proper divisors (1).

85717217 is an equidigital number, since it uses as much as digits as its factorization.

85717217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27440, while the sum is 38.

The square root of 85717217 is about 9258.3593038940. The cubic root of 85717217 is about 440.9161643931.

The spelling of 85717217 in words is "eighty-five million, seven hundred seventeen thousand, two hundred seventeen".