6716521 has 8 divisors (see below), whose sum is σ = 7691840. Its totient is φ = 5745168.

The previous prime is 6716477. The next prime is 6716533. The reversal of 6716521 is 1256176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6716521 - 2⁷ = 6716393 is a prime.

It is a super-2 number, since 2×6716521² = 90223308686882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6716521.

It is not an unprimeable number, because it can be changed into a prime (6716551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5455 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (961480).

Almost surely, 2^6716521 is an apocalyptic number.

It is an amenable number.

6716521 is a deficient number, since it is larger than the sum of its proper divisors (975319).

6716521 is a wasteful number, since it uses less digits than its factorization.

6716521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983.

The product of its digits is 2520, while the sum is 28.

The square root of 6716521 is about 2591.6251657985. The cubic root of 6716521 is about 188.6751883981.

The spelling of 6716521 in words is "six million, seven hundred sixteen thousand, five hundred twenty-one".