11111112517 has 4 divisors (see below), whose sum is σ = 11116689580. Its totient is φ = 11105535456.

The previous prime is 11111112491. The next prime is 11111112521. The reversal of 11111112517 is 71521111111.

It is a happy number.

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 6949056321 + 4162056196 = 83361^2 + 64514^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111112517 - 2¹¹ = 11111110469 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 (11111119517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785542 + ... + 2789527.

It is an arithmetic number, because the mean of its divisors is an integer number (2779172395).

Almost surely, 2^11111112517 is an apocalyptic number.

It is an amenable number.

11111112517 is a deficient number, since it is larger than the sum of its proper divisors (5577063).

11111112517 is an equidigital number, since it uses as much as digits as its factorization.

11111112517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5577062.

The product of its digits is 70, while the sum is 22.

Adding to 11111112517 its reverse (71521111111), we get a palindrome (82632223628).

The spelling of 11111112517 in words is "eleven billion, one hundred eleven million, one hundred twelve thousand, five hundred seventeen".