6706621 has 2 divisors, whose sum is σ = 6706622. Its totient is φ = 6706620.

The previous prime is 6706613. The next prime is 6706631. The reversal of 6706621 is 1266076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6446521 + 260100 = 2539^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 6706621 - 2³ = 6706613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6706621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6706631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3353310 + 3353311.

It is an arithmetic number, because the mean of its divisors is an integer number (3353311).

Almost surely, 2^6706621 is an apocalyptic number.

It is an amenable number.

6706621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6706621 is an equidigital number, since it uses as much as digits as its factorization.

6706621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 6706621 is about 2589.7144630248. The cubic root of 6706621 is about 188.5824418280.

The spelling of 6706621 in words is "six million, seven hundred six thousand, six hundred twenty-one".