6221556 has 48 divisors (see below), whose sum is σ = 17599680. Its totient is φ = 1884960.

The previous prime is 6221549. The next prime is 6221557. The reversal of 6221556 is 6551226.

6221556 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×6221556² = 77415518122272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6221557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1431 + ... + 3806.

It is an arithmetic number, because the mean of its divisors is an integer number (366660).

Almost surely, 2^6221556 is an apocalyptic number.

6221556 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6221556 is an abundant number, since it is smaller than the sum of its proper divisors (11378124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6221556 is a wasteful number, since it uses less digits than its factorization.

6221556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261 (or 5253 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 6221556 is about 2494.3047127406. The cubic root of 6221556 is about 183.9217137033.

Adding to 6221556 its product of digits (3600), we get a triangular number (6225156 = T₃₅₂₈).

The spelling of 6221556 in words is "six million, two hundred twenty-one thousand, five hundred fifty-six".