6621147 has 12 divisors (see below), whose sum is σ = 10299744. Its totient is φ = 4074480.

The previous prime is 6621137. The next prime is 6621151. The reversal of 6621147 is 7411266.

It is not a de Polignac number, because 6621147 - 2¹¹ = 6619099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6621147.

It is not an unprimeable number, because it can be changed into a prime (6621127) 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 11 ways as a sum of consecutive naturals, for example, 28179 + ... + 28412.

It is an arithmetic number, because the mean of its divisors is an integer number (858312).

Almost surely, 2^6621147 is an apocalyptic number.

6621147 is a deficient number, since it is larger than the sum of its proper divisors (3678597).

6621147 is a wasteful number, since it uses less digits than its factorization.

6621147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56610 (or 56607 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 6621147 is about 2573.1589535044. The cubic root of 6621147 is about 187.7778706653. Note that the first 3 decimals are identical.

The spelling of 6621147 in words is "six million, six hundred twenty-one thousand, one hundred forty-seven".