6847517521 has 16 divisors (see below), whose sum is σ = 7893950400. Its totient is φ = 5886606528.

The previous prime is 6847517459. The next prime is 6847517549. The reversal of 6847517521 is 1257157486.

6847517521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6847517521 - 2⁷ = 6847517393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6847517821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220366 + ... + 249511.

It is an arithmetic number, because the mean of its divisors is an integer number (493371900).

Almost surely, 2^6847517521 is an apocalyptic number.

It is an amenable number.

6847517521 is a deficient number, since it is larger than the sum of its proper divisors (1046432879).

6847517521 is a wasteful number, since it uses less digits than its factorization.

6847517521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469968.

The product of its digits is 470400, while the sum is 46.

The square root of 6847517521 is about 82749.7282231187. The cubic root of 6847517521 is about 1898.9391604362.

The spelling of 6847517521 in words is "six billion, eight hundred forty-seven million, five hundred seventeen thousand, five hundred twenty-one".