11155400309 has 2 divisors, whose sum is σ = 11155400310. Its totient is φ = 11155400308.

The previous prime is 11155400299. The next prime is 11155400317. The reversal of 11155400309 is 90300455111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11052316900 + 103083409 = 105130^2 + 10153^2 .

It is a cyclic number.

It is not a de Polignac number, because 11155400309 - 2²⁸ = 10886964853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11155400329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5577700154 + 5577700155.

It is an arithmetic number, because the mean of its divisors is an integer number (5577700155).

Almost surely, 2^11155400309 is an apocalyptic number.

It is an amenable number.

11155400309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11155400309 is an equidigital number, since it uses as much as digits as its factorization.

11155400309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 29.

The spelling of 11155400309 in words is "eleven billion, one hundred fifty-five million, four hundred thousand, three hundred nine".