11491009 has 2 divisors, whose sum is σ = 11491010. Its totient is φ = 11491008.

The previous prime is 11491001. The next prime is 11491013. The reversal of 11491009 is 90019411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8105409 + 3385600 = 2847^2 + 1840^2 .

It is an emirp because it is prime and its reverse (90019411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11491009 - 2³ = 11491001 is a prime.

It is not a weakly prime, because it can be changed into another prime (11491001) 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, 5745504 + 5745505.

It is an arithmetic number, because the mean of its divisors is an integer number (5745505).

Almost surely, 2^11491009 is an apocalyptic number.

It is an amenable number.

11491009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11491009 is an equidigital number, since it uses as much as digits as its factorization.

11491009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 11491009 is about 3389.8390817264. The cubic root of 11491009 is about 225.6590323968.

The spelling of 11491009 in words is "eleven million, four hundred ninety-one thousand, nine".