11555009 has 2 divisors, whose sum is σ = 11555010. Its totient is φ = 11555008.

The previous prime is 11554999. The next prime is 11555023. The reversal of 11555009 is 90055511.

11555009 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., 6265009 + 5290000 = 2503^2 + 2300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11555009 is a prime.

It is not a weakly prime, because it can be changed into another prime (11555029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777504 + 5777505.

It is an arithmetic number, because the mean of its divisors is an integer number (5777505).

Almost surely, 2^11555009 is an apocalyptic number.

It is an amenable number.

11555009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555009 is an equidigital number, since it uses as much as digits as its factorization.

11555009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 11555009 is about 3399.2659501722. The cubic root of 11555009 is about 226.0771984163.

The spelling of 11555009 in words is "eleven million, five hundred fifty-five thousand, nine".