6715921 has 2 divisors, whose sum is σ = 6715922. Its totient is φ = 6715920.

The previous prime is 6715913. The next prime is 6715937. The reversal of 6715921 is 1295176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6275025 + 440896 = 2505^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 6715921 - 2³ = 6715913 is a prime.

It is not a weakly prime, because it can be changed into another prime (6715991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3357960 + 3357961.

It is an arithmetic number, because the mean of its divisors is an integer number (3357961).

Almost surely, 2^6715921 is an apocalyptic number.

It is an amenable number.

6715921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6715921 is an equidigital number, since it uses as much as digits as its factorization.

6715921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 6715921 is about 2591.5094057325. The cubic root of 6715921 is about 188.6695699892.

The spelling of 6715921 in words is "six million, seven hundred fifteen thousand, nine hundred twenty-one".