6536821 has 8 divisors (see below), whose sum is σ = 6716088. Its totient is φ = 6360000.

The previous prime is 6536813. The next prime is 6536837. The reversal of 6536821 is 1286356.

It can be written as a sum of positive squares in 4 ways, for example, as 1311025 + 5225796 = 1145^2 + 2286^2 .

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 6536821 - 2³ = 6536813 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6536801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5631 + ... + 6691.

It is an arithmetic number, because the mean of its divisors is an integer number (839511).

Almost surely, 2^6536821 is an apocalyptic number.

6536821 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6536821 is a deficient number, since it is larger than the sum of its proper divisors (179267).

6536821 is a wasteful number, since it uses less digits than its factorization.

6536821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223.

The product of its digits is 8640, while the sum is 31.

The square root of 6536821 is about 2556.7207512750. The cubic root of 6536821 is about 186.9772914173.

The spelling of 6536821 in words is "six million, five hundred thirty-six thousand, eight hundred twenty-one".