6681329 has 2 divisors, whose sum is σ = 6681330. Its totient is φ = 6681328.

The previous prime is 6681287. The next prime is 6681359. The reversal of 6681329 is 9231866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 204304 = 2545^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 6681329 - 2¹² = 6677233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6681359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340664 + 3340665.

It is an arithmetic number, because the mean of its divisors is an integer number (3340665).

Almost surely, 2^6681329 is an apocalyptic number.

It is an amenable number.

6681329 is a deficient number, since it is larger than the sum of its proper divisors (1).

6681329 is an equidigital number, since it uses as much as digits as its factorization.

6681329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 6681329 is about 2584.8266866465. The cubic root of 6681329 is about 188.3450825851.

The spelling of 6681329 in words is "six million, six hundred eighty-one thousand, three hundred twenty-nine".