856275217 has 4 divisors (see below), whose sum is σ = 978600256. Its totient is φ = 733950180.

The previous prime is 856275139. The next prime is 856275221. The reversal of 856275217 is 712572658.

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.

It is a cyclic number.

It is not a de Polignac number, because 856275217 - 2⁷ = 856275089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856275317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61162509 + ... + 61162522.

It is an arithmetic number, because the mean of its divisors is an integer number (244650064).

Almost surely, 2^856275217 is an apocalyptic number.

It is an amenable number.

856275217 is a deficient number, since it is larger than the sum of its proper divisors (122325039).

856275217 is a wasteful number, since it uses less digits than its factorization.

856275217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122325038.

The product of its digits is 235200, while the sum is 43.

The square root of 856275217 is about 29262.1806603677. The cubic root of 856275217 is about 949.5936274874.

The spelling of 856275217 in words is "eight hundred fifty-six million, two hundred seventy-five thousand, two hundred seventeen".