11181909313 has 4 divisors (see below), whose sum is σ = 11392888788. Its totient is φ = 10970929840.

The previous prime is 11181909259. The next prime is 11181909331. The reversal of 11181909313 is 31390918111.

11181909313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31390918111 = 7 ⋅4484416873.

It can be written as a sum of positive squares in 2 ways, for example, as 6039154944 + 5142754369 = 77712^2 + 71713^2 .

It is a cyclic number.

It is not a de Polignac number, because 11181909313 - 2¹⁷ = 11181778241 is a prime.

It is a super-2 number, since 2×11181909313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11181909353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105489658 + ... + 105489763.

It is an arithmetic number, because the mean of its divisors is an integer number (2848222197).

Almost surely, 2^11181909313 is an apocalyptic number.

It is an amenable number.

11181909313 is a deficient number, since it is larger than the sum of its proper divisors (210979475).

11181909313 is an equidigital number, since it uses as much as digits as its factorization.

11181909313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210979474.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 11181909313 in words is "eleven billion, one hundred eighty-one million, nine hundred nine thousand, three hundred thirteen".