6751681 has 2 divisors, whose sum is σ = 6751682. Its totient is φ = 6751680.

The previous prime is 6751651. The next prime is 6751687. The reversal of 6751681 is 1861576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5290000 + 1461681 = 2300^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 6751681 - 2⁷ = 6751553 is a prime.

It is a super-3 number, since 3×6751681³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

6751681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6751687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3375840 + 3375841.

It is an arithmetic number, because the mean of its divisors is an integer number (3375841).

Almost surely, 2^6751681 is an apocalyptic number.

It is an amenable number.

6751681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6751681 is an equidigital number, since it uses as much as digits as its factorization.

6751681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 6751681 is about 2598.3996998153. The cubic root of 6751681 is about 189.0038445323.

The spelling of 6751681 in words is "six million, seven hundred fifty-one thousand, six hundred eighty-one".