11791136569 has 3 divisors (see below), whose sum is σ = 11791245157. Its totient is φ = 11791027982.

The previous prime is 11791136561. The next prime is 11791136629. The reversal of 11791136569 is 96563119711.

The square root of 11791136569 is 108587.

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: 96563119711 = 77267 ⋅1249733.

It is not a de Polignac number, because 11791136569 - 2³ = 11791136561 is a prime.

It is a super-2 number, since 2×11791136569² (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 (11791136561) 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, 54294 + ... + 162880.

Almost surely, 2^11791136569 is an apocalyptic number.

11791136569 is the 108587-th square number.

11791136569 is the 54294-th centered octagonal number.

It is an amenable number.

11791136569 is a deficient number, since it is larger than the sum of its proper divisors (108588).

11791136569 is an frugal number, since it uses more digits than its factorization.

11791136569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217174 (or 108587 counting only the distinct ones).

The product of its digits is 306180, while the sum is 49.

Multiplying 11791136569 by its sum of digits (49), we get a square (577765691881 = 760109²).

The spelling of 11791136569 in words is "eleven billion, seven hundred ninety-one million, one hundred thirty-six thousand, five hundred sixty-nine".