11217563569 has 3 divisors (see below), whose sum is σ = 11217669483. Its totient is φ = 11217457656.

The previous prime is 11217563561. The next prime is 11217563603. The reversal of 11217563569 is 96536571211.

The square root of 11217563569 is 105913.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96536571211 = 19 ⋅5080872169.

It can be written as a sum of positive squares in only one way, i.e., 6820282225 + 4397281344 = 82585^2 + 66312^2 .

It is not a de Polignac number, because 11217563569 - 2³ = 11217563561 is a prime.

It is a super-2 number, since 2×11217563569² (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 (11217563561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 52957 + ... + 158869.

It is an arithmetic number, because the mean of its divisors is an integer number (3739223161).

Almost surely, 2^11217563569 is an apocalyptic number.

11217563569 is the 105913-rd square number.

11217563569 is the 52957-th centered octagonal number.

It is an amenable number.

11217563569 is a deficient number, since it is larger than the sum of its proper divisors (105914).

11217563569 is an frugal number, since it uses more digits than its factorization.

11217563569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211826 (or 105913 counting only the distinct ones).

The product of its digits is 340200, while the sum is 46.

The spelling of 11217563569 in words is "eleven billion, two hundred seventeen million, five hundred sixty-three thousand, five hundred sixty-nine".