6493681 has 2 divisors, whose sum is σ = 6493682. Its totient is φ = 6493680.

The previous prime is 6493679. The next prime is 6493699. The reversal of 6493681 is 1863946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5475600 + 1018081 = 2340^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 6493681 - 2¹ = 6493679 is a prime.

It is a super-2 number, since 2×6493681² = 84335785859522, which contains 22 as substring.

Together with 6493679, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6493681.

It is not a weakly prime, because it can be changed into another prime (6493631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3246840 + 3246841.

It is an arithmetic number, because the mean of its divisors is an integer number (3246841).

Almost surely, 2^6493681 is an apocalyptic number.

It is an amenable number.

6493681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6493681 is an equidigital number, since it uses as much as digits as its factorization.

6493681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 6493681 is about 2548.2701976046. The cubic root of 6493681 is about 186.5650619816.

The spelling of 6493681 in words is "six million, four hundred ninety-three thousand, six hundred eighty-one".