85172017 has 4 divisors (see below), whose sum is σ = 97339456. Its totient is φ = 73004580.

The previous prime is 85172011. The next prime is 85172063. The reversal of 85172017 is 71027158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71027158 = 2 ⋅35513579.

It is a cyclic number.

It is not a de Polignac number, because 85172017 - 2²³ = 76783409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85172017.

It is not an unprimeable number, because it can be changed into a prime (85172011) 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, 6083709 + ... + 6083722.

It is an arithmetic number, because the mean of its divisors is an integer number (24334864).

Almost surely, 2^85172017 is an apocalyptic number.

It is an amenable number.

85172017 is a deficient number, since it is larger than the sum of its proper divisors (12167439).

85172017 is a wasteful number, since it uses less digits than its factorization.

85172017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12167438.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 85172017 is about 9228.8686738950. The cubic root of 85172017 is about 439.9793671454.

The spelling of 85172017 in words is "eighty-five million, one hundred seventy-two thousand, seventeen".