6620309 has 2 divisors, whose sum is σ = 6620310. Its totient is φ = 6620308.

The previous prime is 6620291. The next prime is 6620351. The reversal of 6620309 is 9030266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5712100 + 908209 = 2390^2 + 953^2 .

It is a cyclic number.

It is not a de Polignac number, because 6620309 - 2¹⁶ = 6554773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6620399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310154 + 3310155.

It is an arithmetic number, because the mean of its divisors is an integer number (3310155).

Almost surely, 2^6620309 is an apocalyptic number.

It is an amenable number.

6620309 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620309 is an equidigital number, since it uses as much as digits as its factorization.

6620309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 6620309 is about 2572.9961134833. The cubic root of 6620309 is about 187.7699483474.

The spelling of 6620309 in words is "six million, six hundred twenty thousand, three hundred nine".