8781282509 has 4 divisors (see below), whose sum is σ = 8787327516. Its totient is φ = 8775237504.

The previous prime is 8781282481. The next prime is 8781282533. The reversal of 8781282509 is 9052821878.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7617449284 + 1163833225 = 87278^2 + 34115^2 .

It is a cyclic number.

It is not a de Polignac number, because 8781282509 - 2³² = 4486315213 is a prime.

It is a super-2 number, since 2×8781282509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8781282599) 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 3 ways as a sum of consecutive naturals, for example, 3020324 + ... + 3023229.

It is an arithmetic number, because the mean of its divisors is an integer number (2196831879).

Almost surely, 2^8781282509 is an apocalyptic number.

It is an amenable number.

8781282509 is a deficient number, since it is larger than the sum of its proper divisors (6045007).

8781282509 is a wasteful number, since it uses less digits than its factorization.

8781282509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045006.

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 8781282509 is about 93708.4975282391. The cubic root of 8781282509 is about 2063.0954272020.

The spelling of 8781282509 in words is "eight billion, seven hundred eighty-one million, two hundred eighty-two thousand, five hundred nine".