6622521 has 8 divisors (see below), whose sum is σ = 8875200. Its totient is φ = 4392432.

The previous prime is 6622501. The next prime is 6622523. The reversal of 6622521 is 1252266.

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

It is not a de Polignac number, because 6622521 - 2⁵ = 6622489 is a prime.

6622521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6622491 and 6622500.

It is not an unprimeable number, because it can be changed into a prime (6622523) 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, 4950 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (1109400).

Almost surely, 2^6622521 is an apocalyptic number.

It is an amenable number.

6622521 is a deficient number, since it is larger than the sum of its proper divisors (2252679).

6622521 is a wasteful number, since it uses less digits than its factorization.

6622521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11295.

The product of its digits is 1440, while the sum is 24.

The square root of 6622521 is about 2573.4259266589. The cubic root of 6622521 is about 187.7908587951.

Adding to 6622521 its reverse (1252266), we get a palindrome (7874787).

The spelling of 6622521 in words is "six million, six hundred twenty-two thousand, five hundred twenty-one".