6521047009 has 9 divisors (see below), whose sum is σ = 6818840049. Its totient is φ = 6235746660.

The previous prime is 6521046997. The next prime is 6521047031. The reversal of 6521047009 is 9007401256.

The square root of 6521047009 is 80753.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 6521047009 - 2⁵ = 6521046977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6521047109) 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 in 8 ways as a sum of consecutive naturals, for example, 1855564 + ... + 1859074.

Almost surely, 2^6521047009 is an apocalyptic number.

6521047009 is the 80753-rd square number.

6521047009 is the 40377-th centered octagonal number.

It is an amenable number.

6521047009 is a deficient number, since it is larger than the sum of its proper divisors (297793040).

6521047009 is an frugal number, since it uses more digits than its factorization.

6521047009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7068 (or 3534 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The cubic root of 6521047009 is about 1868.2677209111.

The spelling of 6521047009 in words is "six billion, five hundred twenty-one million, forty-seven thousand, nine".