6687013 has 2 divisors, whose sum is σ = 6687014. Its totient is φ = 6687012.

The previous prime is 6687011. The next prime is 6687017. The reversal of 6687013 is 3107866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4072324 + 2614689 = 2018^2 + 1617^2 .

It is a cyclic number.

It is not a de Polignac number, because 6687013 - 2¹ = 6687011 is a prime.

It is a super-2 number, since 2×6687013² = 89432285724338, which contains 22 as substring.

Together with 6687011, it forms a pair of twin primes.

6687013 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6687011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343506 + 3343507.

It is an arithmetic number, because the mean of its divisors is an integer number (3343507).

Almost surely, 2^6687013 is an apocalyptic number.

It is an amenable number.

6687013 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687013 is an equidigital number, since it uses as much as digits as its factorization.

6687013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 6687013 is about 2585.9259463488. The cubic root of 6687013 is about 188.3984776511.

The spelling of 6687013 in words is "six million, six hundred eighty-seven thousand, thirteen".