6681403 has 2 divisors, whose sum is σ = 6681404. Its totient is φ = 6681402.

The previous prime is 6681377. The next prime is 6681419. The reversal of 6681403 is 3041866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6681403 is a prime.

It is a super-2 number, since 2×6681403² = 89282292096818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6681443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340701 + 3340702.

It is an arithmetic number, because the mean of its divisors is an integer number (3340702).

Almost surely, 2^6681403 is an apocalyptic number.

6681403 is a deficient number, since it is larger than the sum of its proper divisors (1).

6681403 is an equidigital number, since it uses as much as digits as its factorization.

6681403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 6681403 is about 2584.8410009128. The cubic root of 6681403 is about 188.3457779300.

The spelling of 6681403 in words is "six million, six hundred eighty-one thousand, four hundred three".