2665009 has 2 divisors, whose sum is σ = 2665010. Its totient is φ = 2665008.

The previous prime is 2665007. The next prime is 2665021. The reversal of 2665009 is 9005662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 815409 = 1360^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665009 - 2¹ = 2665007 is a prime.

Together with 2665007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2665001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332504 + 1332505.

It is an arithmetic number, because the mean of its divisors is an integer number (1332505).

2^2665009 is an apocalyptic number.

It is an amenable number.

2665009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665009 is an equidigital number, since it uses as much as digits as its factorization.

2665009 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 2665009 is about 1632.4855282666. The cubic root of 2665009 is about 138.6435148673.

The spelling of 2665009 in words is "two million, six hundred sixty-five thousand, nine".