6620489 has 2 divisors, whose sum is σ = 6620490. Its totient is φ = 6620488.

The previous prime is 6620461. The next prime is 6620501. The reversal of 6620489 is 9840266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3841600 + 2778889 = 1960^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 6620489 - 2²⁰ = 5571913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6620689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310244 + 3310245.

It is an arithmetic number, because the mean of its divisors is an integer number (3310245).

Almost surely, 2^6620489 is an apocalyptic number.

It is an amenable number.

6620489 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620489 is an equidigital number, since it uses as much as digits as its factorization.

6620489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 6620489 is about 2573.0310919225. The cubic root of 6620489 is about 187.7716500950.

The spelling of 6620489 in words is "six million, six hundred twenty thousand, four hundred eighty-nine".