865513 has 12 divisors (see below), whose sum is σ = 995904. Its totient is φ = 750200.

The previous prime is 865511. The next prime is 865537. The reversal of 865513 is 315568.

It is not a de Polignac number, because 865513 - 2¹ = 865511 is a prime.

It is a super-2 number, since 2×865513² = 1498225506338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2628 + ... + 2938.

It is an arithmetic number, because the mean of its divisors is an integer number (82992).

2⁸⁶⁵⁵¹³ is an apocalyptic number.

It is an amenable number.

865513 is a deficient number, since it is larger than the sum of its proper divisors (130391).

865513 is a wasteful number, since it uses less digits than its factorization.

865513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 345 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 865513 is about 930.3295115173. The cubic root of 865513 is about 95.2996264795.

Subtracting from 865513 its reverse (315568), we obtain a palindrome (549945).

It can be divided in two parts, 8655 and 13, that added together give a palindrome (8668).

The spelling of 865513 in words is "eight hundred sixty-five thousand, five hundred thirteen".