1009909 has 2 divisors, whose sum is σ = 1009910. Its totient is φ = 1009908.

The previous prime is 1009901. The next prime is 1009927. The reversal of 1009909 is 9099001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 253009 = 870^2 + 503^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009909 - 2³ = 1009901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009901) 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, 504954 + 504955.

It is an arithmetic number, because the mean of its divisors is an integer number (504955).

2^1009909 is an apocalyptic number.

It is an amenable number.

1009909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009909 is an equidigital number, since it uses as much as digits as its factorization.

1009909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 1009909 is about 1004.9422869001. The cubic root of 1009909 is about 100.3292149856.

The spelling of 1009909 in words is "one million, nine thousand, nine hundred nine".