6681239 has 2 divisors, whose sum is σ = 6681240. Its totient is φ = 6681238.

The previous prime is 6681209. The next prime is 6681287. The reversal of 6681239 is 9321866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6681239 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6681199 and 6681208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6681209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340619 + 3340620.

It is an arithmetic number, because the mean of its divisors is an integer number (3340620).

Almost surely, 2^6681239 is an apocalyptic number.

6681239 is a deficient number, since it is larger than the sum of its proper divisors (1).

6681239 is an equidigital number, since it uses as much as digits as its factorization.

6681239 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 6681239 is about 2584.8092772969. The cubic root of 6681239 is about 188.3442368884.

The spelling of 6681239 in words is "six million, six hundred eighty-one thousand, two hundred thirty-nine".