6813539 has 2 divisors, whose sum is σ = 6813540. Its totient is φ = 6813538.

The previous prime is 6813529. The next prime is 6813559. The reversal of 6813539 is 9353186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6813539 - 2²⁰ = 5764963 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 6813499 and 6813508.

It is not a weakly prime, because it can be changed into another prime (6813509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3406769 + 3406770.

It is an arithmetic number, because the mean of its divisors is an integer number (3406770).

Almost surely, 2^6813539 is an apocalyptic number.

6813539 is a deficient number, since it is larger than the sum of its proper divisors (1).

6813539 is an equidigital number, since it uses as much as digits as its factorization.

6813539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 6813539 is about 2610.2756559413. The cubic root of 6813539 is about 189.5793000095.

The spelling of 6813539 in words is "six million, eight hundred thirteen thousand, five hundred thirty-nine".