6728531 has 2 divisors, whose sum is σ = 6728532. Its totient is φ = 6728530.

The previous prime is 6728521. The next prime is 6728539. The reversal of 6728531 is 1358276.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6728531 - 2⁶ = 6728467 is a prime.

It is a super-2 number, since 2×6728531² = 90546258835922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6728539) 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 as a sum of consecutive naturals, namely, 3364265 + 3364266.

It is an arithmetic number, because the mean of its divisors is an integer number (3364266).

Almost surely, 2^6728531 is an apocalyptic number.

6728531 is a deficient number, since it is larger than the sum of its proper divisors (1).

6728531 is an equidigital number, since it uses as much as digits as its factorization.

6728531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 6728531 is about 2593.9412098195. The cubic root of 6728531 is about 188.7875799039.

The spelling of 6728531 in words is "six million, seven hundred twenty-eight thousand, five hundred thirty-one".