845217 has 6 divisors (see below), whose sum is σ = 1220882. Its totient is φ = 563472.

The previous prime is 845209. The next prime is 845219. The reversal of 845217 is 712548.

845217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 767376 + 77841 = 876^2 + 279^2 .

It is not a de Polignac number, because 845217 - 2³ = 845209 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 845217.

It is not an unprimeable number, because it can be changed into a prime (845219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46948 + ... + 46965.

2⁸⁴⁵²¹⁷ is an apocalyptic number.

It is an amenable number.

845217 is a deficient number, since it is larger than the sum of its proper divisors (375665).

845217 is a wasteful number, since it uses less digits than its factorization.

845217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93919 (or 93916 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 845217 is about 919.3568404053. The cubic root of 845217 is about 94.5488116019.

The spelling of 845217 in words is "eight hundred forty-five thousand, two hundred seventeen".