11551609 has 2 divisors, whose sum is σ = 11551610. Its totient is φ = 11551608.

The previous prime is 11551597. The next prime is 11551643. The reversal of 11551609 is 90615511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10791225 + 760384 = 3285^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 11551609 - 2⁷ = 11551481 is a prime.

It is not a weakly prime, because it can be changed into another prime (11551679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775804 + 5775805.

It is an arithmetic number, because the mean of its divisors is an integer number (5775805).

Almost surely, 2^11551609 is an apocalyptic number.

It is an amenable number.

11551609 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551609 is an equidigital number, since it uses as much as digits as its factorization.

11551609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 11551609 is about 3398.7658054064. The cubic root of 11551609 is about 226.0550222363.

The spelling of 11551609 in words is "eleven million, five hundred fifty-one thousand, six hundred nine".