11131121717 has 4 divisors (see below), whose sum is σ = 11131703340. Its totient is φ = 11130540096.

The previous prime is 11131121713. The next prime is 11131121731. The reversal of 11131121717 is 71712113111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2160948196 + 8970173521 = 46486^2 + 94711^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131121717 - 2² = 11131121713 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131121713) 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 in 3 ways as a sum of consecutive naturals, for example, 261092 + ... + 300717.

It is an arithmetic number, because the mean of its divisors is an integer number (2782925835).

Almost surely, 2^11131121717 is an apocalyptic number.

It is an amenable number.

11131121717 is a deficient number, since it is larger than the sum of its proper divisors (581623).

11131121717 is an equidigital number, since it uses as much as digits as its factorization.

11131121717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581622.

The product of its digits is 294, while the sum is 26.

Adding to 11131121717 its reverse (71712113111), we get a palindrome (82843234828).

The spelling of 11131121717 in words is "eleven billion, one hundred thirty-one million, one hundred twenty-one thousand, seven hundred seventeen".