2605909 has 2 divisors, whose sum is σ = 2605910. Its totient is φ = 2605908.

The previous prime is 2605871. The next prime is 2605927. The reversal of 2605909 is 9095062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 459684 = 1465^2 + 678^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605909 - 2⁷ = 2605781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2605949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302954 + 1302955.

It is an arithmetic number, because the mean of its divisors is an integer number (1302955).

2^2605909 is an apocalyptic number.

It is an amenable number.

2605909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2605909 is an equidigital number, since it uses as much as digits as its factorization.

2605909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 2605909 is about 1614.2828128925. The cubic root of 2605909 is about 137.6109781725.

The spelling of 2605909 in words is "two million, six hundred five thousand, nine hundred nine".