2606509 has 2 divisors, whose sum is σ = 2606510. Its totient is φ = 2606508.

The previous prime is 2606503. The next prime is 2606519. The reversal of 2606509 is 9056062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1814409 + 792100 = 1347^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 2606509 - 2¹³ = 2598317 is a prime.

2606509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2606503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1303254 + 1303255.

It is an arithmetic number, because the mean of its divisors is an integer number (1303255).

2^2606509 is an apocalyptic number.

It is an amenable number.

2606509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2606509 is an equidigital number, since it uses as much as digits as its factorization.

2606509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 2606509 is about 1614.4686432384. The cubic root of 2606509 is about 137.6215388189.

The spelling of 2606509 in words is "two million, six hundred six thousand, five hundred nine".