6781303321 has 8 divisors (see below), whose sum is σ = 7312915400. Its totient is φ = 6251116032.

The previous prime is 6781303313. The next prime is 6781303339. The reversal of 6781303321 is 1233031876.

It can be written as a sum of positive squares in 4 ways, for example, as 112784400 + 6668518921 = 10620^2 + 81661^2 .

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 6781303321 - 2³ = 6781303313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6781303301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346296 + ... + 365353.

It is an arithmetic number, because the mean of its divisors is an integer number (914114425).

Almost surely, 2^6781303321 is an apocalyptic number.

It is an amenable number.

6781303321 is a deficient number, since it is larger than the sum of its proper divisors (531612079).

6781303321 is a wasteful number, since it uses less digits than its factorization.

6781303321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712395.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 6781303321 is about 82348.6692120765. The cubic root of 6781303321 is about 1892.7985305496.

The spelling of 6781303321 in words is "six billion, seven hundred eighty-one million, three hundred three thousand, three hundred twenty-one".