6475681 has 2 divisors, whose sum is σ = 6475682. Its totient is φ = 6475680.

The previous prime is 6475669. The next prime is 6475687. The reversal of 6475681 is 1865746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5803281 + 672400 = 2409^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 6475681 - 2⁵ = 6475649 is a prime.

It is a super-2 number, since 2×6475681² = 83868888827522, which contains 22 as substring.

6475681 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6475681.

It is not a weakly prime, because it can be changed into another prime (6475687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3237840 + 3237841.

It is an arithmetic number, because the mean of its divisors is an integer number (3237841).

Almost surely, 2^6475681 is an apocalyptic number.

It is an amenable number.

6475681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6475681 is an equidigital number, since it uses as much as digits as its factorization.

6475681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 6475681 is about 2544.7359391497. The cubic root of 6475681 is about 186.3925209749.

It can be divided in two parts, 647 and 5681, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 6475681 in words is "six million, four hundred seventy-five thousand, six hundred eighty-one".