81133241489 has 8 divisors (see below), whose sum is σ = 85909005000. Its totient is φ = 76357835776.

The previous prime is 81133241471. The next prime is 81133241537. The reversal of 81133241489 is 98414233118.

It can be written as a sum of positive squares in 4 ways, for example, as 51445951489 + 29687290000 = 226817^2 + 172300^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81133241489 - 2¹⁶ = 81133175953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81133241429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481637 + ... + 627885.

It is an arithmetic number, because the mean of its divisors is an integer number (10738625625).

Almost surely, 2^81133241489 is an apocalyptic number.

It is an amenable number.

81133241489 is a deficient number, since it is larger than the sum of its proper divisors (4775763511).

81133241489 is a wasteful number, since it uses less digits than its factorization.

81133241489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178899.

The product of its digits is 165888, while the sum is 44.

The spelling of 81133241489 in words is "eighty-one billion, one hundred thirty-three million, two hundred forty-one thousand, four hundred eighty-nine".