6610621 has 2 divisors, whose sum is σ = 6610622. Its totient is φ = 6610620.

The previous prime is 6610619. The next prime is 6610673. The reversal of 6610621 is 1260166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5827396 + 783225 = 2414^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 6610621 - 2¹ = 6610619 is a prime.

Together with 6610619, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6610592 and 6610601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6610601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305310 + 3305311.

It is an arithmetic number, because the mean of its divisors is an integer number (3305311).

Almost surely, 2^6610621 is an apocalyptic number.

It is an amenable number.

6610621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6610621 is an equidigital number, since it uses as much as digits as its factorization.

6610621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 6610621 is about 2571.1127941030. The cubic root of 6610621 is about 187.6783109666.

Adding to 6610621 its reverse (1260166), we get a palindrome (7870787).

The spelling of 6610621 in words is "six million, six hundred ten thousand, six hundred twenty-one".