11975581489 has 3 divisors (see below), whose sum is σ = 11975690923. Its totient is φ = 11975472056.

The previous prime is 11975581483. The next prime is 11975581567. The reversal of 11975581489 is 98418557911.

The square root of 11975581489 is 109433.

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: 98418557911 = 503 ⋅195663137.

It can be written as a sum of positive squares in only one way, i.e., 11179890225 + 795691264 = 105735^2 + 28208^2 .

It is not a de Polignac number, because 11975581489 - 2⁹ = 11975580977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11975581483) 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 2 ways as a sum of consecutive naturals, for example, 54717 + ... + 164149.

Almost surely, 2^11975581489 is an apocalyptic number.

11975581489 is the 109433-rd square number.

11975581489 is the 54717-th centered octagonal number.

It is an amenable number.

11975581489 is a deficient number, since it is larger than the sum of its proper divisors (109434).

11975581489 is an frugal number, since it uses more digits than its factorization.

11975581489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218866 (or 109433 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 58.

The spelling of 11975581489 in words is "eleven billion, nine hundred seventy-five million, five hundred eighty-one thousand, four hundred eighty-nine".