6731729 has 2 divisors, whose sum is σ = 6731730. Its totient is φ = 6731728.

The previous prime is 6731717. The next prime is 6731759. The reversal of 6731729 is 9271376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5650129 + 1081600 = 2377^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 6731729 - 2⁴ = 6731713 is a prime.

It is not a weakly prime, because it can be changed into another prime (6731759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3365864 + 3365865.

It is an arithmetic number, because the mean of its divisors is an integer number (3365865).

Almost surely, 2^6731729 is an apocalyptic number.

It is an amenable number.

6731729 is a deficient number, since it is larger than the sum of its proper divisors (1).

6731729 is an equidigital number, since it uses as much as digits as its factorization.

6731729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 35.

The square root of 6731729 is about 2594.5575730748. The cubic root of 6731729 is about 188.8174847501.

The spelling of 6731729 in words is "six million, seven hundred thirty-one thousand, seven hundred twenty-nine".