865513217 has 16 divisors (see below), whose sum is σ = 891191808. Its totient is φ = 840322560.

The previous prime is 865513189. The next prime is 865513219. The reversal of 865513217 is 712315568.

865513217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 865513217 - 2⁶ = 865513153 is a prime.

It is a super-2 number, since 2×865513217² = 1498226257603378178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865513219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1869128 + ... + 1869590.

It is an arithmetic number, because the mean of its divisors is an integer number (55699488).

Almost surely, 2^865513217 is an apocalyptic number.

It is an amenable number.

865513217 is a deficient number, since it is larger than the sum of its proper divisors (25678591).

865513217 is a wasteful number, since it uses less digits than its factorization.

865513217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its digits is 50400, while the sum is 38.

The square root of 865513217 is about 29419.6059966819. The cubic root of 865513217 is about 952.9963444397.

The spelling of 865513217 in words is "eight hundred sixty-five million, five hundred thirteen thousand, two hundred seventeen".