8013521689 has 2 divisors, whose sum is σ = 8013521690. Its totient is φ = 8013521688.

The previous prime is 8013521671. The next prime is 8013521707. The reversal of 8013521689 is 9861253108.

8013521689 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (8013521671) and next prime (8013521707).

It can be written as a sum of positive squares in only one way, i.e., 7904632464 + 108889225 = 88908^2 + 10435^2 .

It is a cyclic number.

It is not a de Polignac number, because 8013521689 - 2⁹ = 8013521177 is a prime.

It is not a weakly prime, because it can be changed into another prime (8013521629) 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, 4006760844 + 4006760845.

It is an arithmetic number, because the mean of its divisors is an integer number (4006760845).

Almost surely, 2^8013521689 is an apocalyptic number.

It is an amenable number.

8013521689 is a deficient number, since it is larger than the sum of its proper divisors (1).

8013521689 is an equidigital number, since it uses as much as digits as its factorization.

8013521689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 8013521689 is about 89518.2757262449. The cubic root of 8013521689 is about 2001.1261731646.

The spelling of 8013521689 in words is "eight billion, thirteen million, five hundred twenty-one thousand, six hundred eighty-nine".