865333813 has 8 divisors (see below), whose sum is σ = 947830680. Its totient is φ = 786347520.

The previous prime is 865333801. The next prime is 865333817. The reversal of 865333813 is 318333568.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 390181009 + 475152804 = 19753^2 + 21798^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 865333813 - 2²⁵ = 831779381 is a prime.

It is a super-2 number, since 2×865333813² = 1497605215842237938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865333817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877128 + ... + 878113.

It is an arithmetic number, because the mean of its divisors is an integer number (118478835).

Almost surely, 2^865333813 is an apocalyptic number.

It is an amenable number.

865333813 is a deficient number, since it is larger than the sum of its proper divisors (82496867).

865333813 is a wasteful number, since it uses less digits than its factorization.

865333813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755287.

The product of its digits is 155520, while the sum is 40.

The square root of 865333813 is about 29416.5567835530. The cubic root of 865333813 is about 952.9304940413.

The spelling of 865333813 in words is "eight hundred sixty-five million, three hundred thirty-three thousand, eight hundred thirteen".