6987009152521 has 2 divisors, whose sum is σ = 6987009152522. Its totient is φ = 6987009152520.

The previous prime is 6987009152509. The next prime is 6987009152609. The reversal of 6987009152521 is 1252519007896.

6987009152521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4949895226896 + 2037113925625 = 2224836^2 + 1427275^2 .

It is a cyclic number.

It is not a de Polignac number, because 6987009152521 - 2⁵ = 6987009152489 is a prime.

It is not a weakly prime, because it can be changed into another prime (6987009159521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3493504576260 + 3493504576261.

It is an arithmetic number, because the mean of its divisors is an integer number (3493504576261).

Almost surely, 2^{6987009152521} is an apocalyptic number.

It is an amenable number.

6987009152521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6987009152521 is an equidigital number, since it uses as much as digits as its factorization.

6987009152521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 6987009152521 in words is "six trillion, nine hundred eighty-seven billion, nine million, one hundred fifty-two thousand, five hundred twenty-one".