6621247 has 4 divisors (see below), whose sum is σ = 6714576. Its totient is φ = 6527920.

The previous prime is 6621239. The next prime is 6621281. The reversal of 6621247 is 7421266.

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 6621247 - 2³ = 6621239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46558 + ... + 46699.

It is an arithmetic number, because the mean of its divisors is an integer number (1678644).

Almost surely, 2^6621247 is an apocalyptic number.

6621247 is a deficient number, since it is larger than the sum of its proper divisors (93329).

6621247 is an equidigital number, since it uses as much as digits as its factorization.

6621247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93328.

The product of its digits is 4032, while the sum is 28.

The square root of 6621247 is about 2573.1783847996. The cubic root of 6621247 is about 187.7788160047.

The spelling of 6621247 in words is "six million, six hundred twenty-one thousand, two hundred forty-seven".