11191009 has 2 divisors, whose sum is σ = 11191010. Its totient is φ = 11191008.

The previous prime is 11190997. The next prime is 11191027. The reversal of 11191009 is 90019111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 595984 = 3255^2 + 772^2 .

It is a cyclic number.

It is not a de Polignac number, because 11191009 - 2¹³ = 11182817 is a prime.

It is not a weakly prime, because it can be changed into another prime (11191039) 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, 5595504 + 5595505.

It is an arithmetic number, because the mean of its divisors is an integer number (5595505).

Almost surely, 2^11191009 is an apocalyptic number.

It is an amenable number.

11191009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11191009 is an equidigital number, since it uses as much as digits as its factorization.

11191009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 22.

The square root of 11191009 is about 3345.2965488877. The cubic root of 11191009 is about 223.6779025536.

The spelling of 11191009 in words is "eleven million, one hundred ninety-one thousand, nine".