7713000721 has 2 divisors, whose sum is σ = 7713000722. Its totient is φ = 7713000720.

The previous prime is 7713000719. The next prime is 7713000731. The reversal of 7713000721 is 1270003177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7654325121 + 58675600 = 87489^2 + 7660^2 .

It is a cyclic number.

It is not a de Polignac number, because 7713000721 - 2¹ = 7713000719 is a prime.

Together with 7713000719, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7713000721.

It is not a weakly prime, because it can be changed into another prime (7713000731) 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 as a sum of consecutive naturals, namely, 3856500360 + 3856500361.

It is an arithmetic number, because the mean of its divisors is an integer number (3856500361).

Almost surely, 2^7713000721 is an apocalyptic number.

It is an amenable number.

7713000721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7713000721 is an equidigital number, since it uses as much as digits as its factorization.

7713000721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2058, while the sum is 28.

The square root of 7713000721 is about 87823.6911146417. The cubic root of 7713000721 is about 1975.7915511981.

Adding to 7713000721 its reverse (1270003177), we get a palindrome (8983003898).

The spelling of 7713000721 in words is "seven billion, seven hundred thirteen million, seven hundred twenty-one", and thus it is an aban number.