11709409 has 2 divisors, whose sum is σ = 11709410. Its totient is φ = 11709408.

The previous prime is 11709407. The next prime is 11709421. The reversal of 11709409 is 90490711.

11709409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10543009 + 1166400 = 3247^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 11709409 - 2¹ = 11709407 is a prime.

It is a super-2 number, since 2×11709409² = 274220518258562, which contains 22 as substring.

Together with 11709407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11709407) 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, 5854704 + 5854705.

It is an arithmetic number, because the mean of its divisors is an integer number (5854705).

Almost surely, 2^11709409 is an apocalyptic number.

It is an amenable number.

11709409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11709409 is an equidigital number, since it uses as much as digits as its factorization.

11709409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 11709409 is about 3421.9013720445. The cubic root of 11709409 is about 227.0797070449.

The spelling of 11709409 in words is "eleven million, seven hundred nine thousand, four hundred nine".