6221280811 has 4 divisors (see below), whose sum is σ = 6224172552. Its totient is φ = 6218389072.

The previous prime is 6221280809. The next prime is 6221280829. The reversal of 6221280811 is 1180821226.

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

It is a cyclic number.

It is not a de Polignac number, because 6221280811 - 2¹ = 6221280809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6221280851) 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 3 ways as a sum of consecutive naturals, for example, 1442641 + ... + 1446946.

It is an arithmetic number, because the mean of its divisors is an integer number (1556043138).

Almost surely, 2^6221280811 is an apocalyptic number.

6221280811 is a deficient number, since it is larger than the sum of its proper divisors (2891741).

6221280811 is a wasteful number, since it uses less digits than its factorization.

6221280811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891740.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 6221280811 is about 78875.0962661853. The cubic root of 6221280811 is about 1839.1900194977.

The spelling of 6221280811 in words is "six billion, two hundred twenty-one million, two hundred eighty thousand, eight hundred eleven".