11131535209 has 2 divisors, whose sum is σ = 11131535210. Its totient is φ = 11131535208.

The previous prime is 11131535197. The next prime is 11131535231. The reversal of 11131535209 is 90253513111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8882120025 + 2249415184 = 94245^2 + 47428^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131535209 - 2²¹ = 11129438057 is a prime.

It is a super-2 number, since 2×11131535209² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11131535249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565767604 + 5565767605.

It is an arithmetic number, because the mean of its divisors is an integer number (5565767605).

Almost surely, 2^11131535209 is an apocalyptic number.

It is an amenable number.

11131535209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131535209 is an equidigital number, since it uses as much as digits as its factorization.

11131535209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 31.

The spelling of 11131535209 in words is "eleven billion, one hundred thirty-one million, five hundred thirty-five thousand, two hundred nine".