6621013 has 8 divisors (see below), whose sum is σ = 7584128. Its totient is φ = 5662224.

The previous prime is 6620981. The next prime is 6621029. The reversal of 6621013 is 3101266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6621013 - 2⁵ = 6620981 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 (6621413) 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 7 ways as a sum of consecutive naturals, for example, 3520 + ... + 5062.

It is an arithmetic number, because the mean of its divisors is an integer number (948016).

Almost surely, 2^6621013 is an apocalyptic number.

It is an amenable number.

6621013 is a deficient number, since it is larger than the sum of its proper divisors (963115).

6621013 is a wasteful number, since it uses less digits than its factorization.

6621013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 6621013 is about 2573.1329153388. The cubic root of 6621013 is about 187.7766038957.

Adding to 6621013 its reverse (3101266), we get a palindrome (9722279).

The spelling of 6621013 in words is "six million, six hundred twenty-one thousand, thirteen".