85809617 has 4 divisors (see below), whose sum is σ = 86773860. Its totient is φ = 84845376.

The previous prime is 85809611. The next prime is 85809631. The reversal of 85809617 is 71690858.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71690858 = 2 ⋅35845429.

It can be written as a sum of positive squares in 2 ways, for example, as 50751376 + 35058241 = 7124^2 + 5921^2 .

It is a cyclic number.

It is not a de Polignac number, because 85809617 - 2²⁴ = 69032401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85809611) 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, 481988 + ... + 482165.

It is an arithmetic number, because the mean of its divisors is an integer number (21693465).

Almost surely, 2^85809617 is an apocalyptic number.

It is an amenable number.

85809617 is a deficient number, since it is larger than the sum of its proper divisors (964243).

85809617 is an equidigital number, since it uses as much as digits as its factorization.

85809617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964242.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 85809617 is about 9263.3480448486. The cubic root of 85809617 is about 441.0745379568.

The spelling of 85809617 in words is "eighty-five million, eight hundred nine thousand, six hundred seventeen".