6221881 has 6 divisors (see below), whose sum is σ = 6609710. Its totient is φ = 5855616.

The previous prime is 6221879. The next prime is 6221909. The reversal of 6221881 is 1881226.

It can be written as a sum of positive squares in 3 ways, for example, as 1452025 + 4769856 = 1205^2 + 2184^2 .

It is not a de Polignac number, because 6221881 - 2¹ = 6221879 is a prime.

It is a super-2 number, since 2×6221881² = 77423606356322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6221081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10476 + ... + 11053.

Almost surely, 2^6221881 is an apocalyptic number.

It is an amenable number.

6221881 is a deficient number, since it is larger than the sum of its proper divisors (387829).

6221881 is a wasteful number, since it uses less digits than its factorization.

6221881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21563 (or 21546 counting only the distinct ones).

The product of its digits is 1536, while the sum is 28.

The square root of 6221881 is about 2494.3698603054. The cubic root of 6221881 is about 183.9249161988.

The spelling of 6221881 in words is "six million, two hundred twenty-one thousand, eight hundred eighty-one".