8306721361 has 4 divisors (see below), whose sum is σ = 8339043492. Its totient is φ = 8274399232.

The previous prime is 8306721349. The next prime is 8306721383. The reversal of 8306721361 is 1631276038.

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 3774873600 + 4531847761 = 61440^2 + 67319^2 .

It is a cyclic number.

It is not a de Polignac number, because 8306721361 - 2⁵ = 8306721329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8306721361.

It is not an unprimeable number, because it can be changed into a prime (8306721341) 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 3 ways as a sum of consecutive naturals, for example, 16160680 + ... + 16161193.

It is an arithmetic number, because the mean of its divisors is an integer number (2084760873).

Almost surely, 2^8306721361 is an apocalyptic number.

It is an amenable number.

8306721361 is a deficient number, since it is larger than the sum of its proper divisors (32322131).

8306721361 is a wasteful number, since it uses less digits than its factorization.

8306721361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32322130.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 8306721361 is about 91141.2165872280. The cubic root of 8306721361 is about 2025.2402386116.

Adding to 8306721361 its reverse (1631276038), we get a palindrome (9937997399).

The spelling of 8306721361 in words is "eight billion, three hundred six million, seven hundred twenty-one thousand, three hundred sixty-one".