9713894521 has 2 divisors, whose sum is σ = 9713894522. Its totient is φ = 9713894520.

The previous prime is 9713894453. The next prime is 9713894539. The reversal of 9713894521 is 1254983179.

It is a happy number.

9713894521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5232930921 + 4480963600 = 72339^2 + 66940^2 .

It is a cyclic number.

It is not a de Polignac number, because 9713894521 - 2⁹ = 9713894009 is a prime.

It is a super-2 number, since 2×9713894521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9713894551) 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, 4856947260 + 4856947261.

It is an arithmetic number, because the mean of its divisors is an integer number (4856947261).

Almost surely, 2^9713894521 is an apocalyptic number.

It is an amenable number.

9713894521 is a deficient number, since it is larger than the sum of its proper divisors (1).

9713894521 is an equidigital number, since it uses as much as digits as its factorization.

9713894521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The square root of 9713894521 is about 98559.0915187432. The cubic root of 9713894521 is about 2133.6890467693.

The spelling of 9713894521 in words is "nine billion, seven hundred thirteen million, eight hundred ninety-four thousand, five hundred twenty-one".