11789833561 has 9 divisors (see below), whose sum is σ = 12960386229. Its totient is φ = 10716944700.

The previous prime is 11789833547. The next prime is 11789833567. The reversal of 11789833561 is 16533898711.

The square root of 11789833561 is 108581.

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

It is not a de Polignac number, because 11789833561 - 2¹⁵ = 11789800793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11789833499 and 11789833508.

It is not an unprimeable number, because it can be changed into a prime (11789833567) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1189456 + ... + 1199326.

Almost surely, 2^11789833561 is an apocalyptic number.

11789833561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11789833561 is the 108581-st square number.

11789833561 is the 54291-st centered octagonal number.

It is an amenable number.

11789833561 is a deficient number, since it is larger than the sum of its proper divisors (1170552668).

11789833561 is an frugal number, since it uses more digits than its factorization.

11789833561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19764 (or 9882 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The spelling of 11789833561 in words is "eleven billion, seven hundred eighty-nine million, eight hundred thirty-three thousand, five hundred sixty-one".