5311685821 has 4 divisors (see below), whose sum is σ = 5720277052. Its totient is φ = 4903094592.

The previous prime is 5311685789. The next prime is 5311685843. The reversal of 5311685821 is 1285861135.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2675992900 + 2635692921 = 51730^2 + 51339^2 .

It is a cyclic number.

It is not a de Polignac number, because 5311685821 - 2⁵ = 5311685789 is a prime.

It is a super-2 number, since 2×5311685821² = 56428012522024888082, 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 (5311685881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204295596 + ... + 204295621.

It is an arithmetic number, because the mean of its divisors is an integer number (1430069263).

Almost surely, 2^5311685821 is an apocalyptic number.

It is an amenable number.

5311685821 is a deficient number, since it is larger than the sum of its proper divisors (408591231).

5311685821 is a wasteful number, since it uses less digits than its factorization.

5311685821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408591230.

The product of its digits is 57600, while the sum is 40.

The square root of 5311685821 is about 72881.3132496938. The cubic root of 5311685821 is about 1744.7938685312.

The spelling of 5311685821 in words is "five billion, three hundred eleven million, six hundred eighty-five thousand, eight hundred twenty-one".