6619609 has 2 divisors, whose sum is σ = 6619610. Its totient is φ = 6619608.

The previous prime is 6619589. The next prime is 6619643. The reversal of 6619609 is 9069166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3504384 + 3115225 = 1872^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 6619609 - 2¹³ = 6611417 is a prime.

It is not a weakly prime, because it can be changed into another prime (6619649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3309804 + 3309805.

It is an arithmetic number, because the mean of its divisors is an integer number (3309805).

Almost surely, 2^6619609 is an apocalyptic number.

It is an amenable number.

6619609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6619609 is an equidigital number, since it uses as much as digits as its factorization.

6619609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 6619609 is about 2572.8600816990. The cubic root of 6619609 is about 187.7633301469.

The spelling of 6619609 in words is "six million, six hundred nineteen thousand, six hundred nine".