6721747 has 2 divisors, whose sum is σ = 6721748. Its totient is φ = 6721746.

The previous prime is 6721739. The next prime is 6721751. The reversal of 6721747 is 7471276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6721747 - 2³ = 6721739 is a prime.

6721747 is a lucky number.

It is equal to p₄₅₈₉₀₈ and since 6721747 and 458908 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (6721787) 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, 3360873 + 3360874.

It is an arithmetic number, because the mean of its divisors is an integer number (3360874).

Almost surely, 2^6721747 is an apocalyptic number.

6721747 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721747 is an equidigital number, since it uses as much as digits as its factorization.

6721747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 34.

The square root of 6721747 is about 2592.6332174066. The cubic root of 6721747 is about 188.7241105961.

The spelling of 6721747 in words is "six million, seven hundred twenty-one thousand, seven hundred forty-seven".