6716921 has 4 divisors (see below), whose sum is σ = 7112052. Its totient is φ = 6321792.

The previous prime is 6716917. The next prime is 6716923. The reversal of 6716921 is 1296176.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6175225 + 541696 = 2485^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 6716921 - 2² = 6716917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6716923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197540 + ... + 197573.

It is an arithmetic number, because the mean of its divisors is an integer number (1778013).

Almost surely, 2^6716921 is an apocalyptic number.

It is an amenable number.

6716921 is a deficient number, since it is larger than the sum of its proper divisors (395131).

6716921 is a wasteful number, since it uses less digits than its factorization.

6716921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395130.

The product of its digits is 4536, while the sum is 32.

The square root of 6716921 is about 2591.7023363033. The cubic root of 6716921 is about 188.6789338182.

The spelling of 6716921 in words is "six million, seven hundred sixteen thousand, nine hundred twenty-one".