85609717 has 4 divisors (see below), whose sum is σ = 85630156. Its totient is φ = 85589280.

The previous prime is 85609673. The next prime is 85609751. The reversal of 85609717 is 71790658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71790658 = 2 ⋅35895329.

It can be written as a sum of positive squares in 2 ways, for example, as 42497361 + 43112356 = 6519^2 + 6566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85609717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85609757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1398 + ... + 13159.

It is an arithmetic number, because the mean of its divisors is an integer number (21407539).

Almost surely, 2^85609717 is an apocalyptic number.

It is an amenable number.

85609717 is a deficient number, since it is larger than the sum of its proper divisors (20439).

85609717 is a wasteful number, since it uses less digits than its factorization.

85609717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20438.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 85609717 is about 9252.5519182548. The cubic root of 85609717 is about 440.7317661369.

The spelling of 85609717 in words is "eighty-five million, six hundred nine thousand, seven hundred seventeen".