11581109 has 2 divisors, whose sum is σ = 11581110. Its totient is φ = 11581108.

The previous prime is 11581099. The next prime is 11581123. The reversal of 11581109 is 90118511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7263025 + 4318084 = 2695^2 + 2078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11581109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11581159) 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, 5790554 + 5790555.

It is an arithmetic number, because the mean of its divisors is an integer number (5790555).

Almost surely, 2^11581109 is an apocalyptic number.

It is an amenable number.

11581109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11581109 is an equidigital number, since it uses as much as digits as its factorization.

11581109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 11581109 is about 3403.1028488719. The cubic root of 11581109 is about 226.2472885118.

The spelling of 11581109 in words is "eleven million, five hundred eighty-one thousand, one hundred nine".