681727 has 2 divisors, whose sum is σ = 681728. Its totient is φ = 681726.

The previous prime is 681719. The next prime is 681731. The reversal of 681727 is 727186.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681727 - 2³ = 681719 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340863 + 340864.

It is an arithmetic number, because the mean of its divisors is an integer number (340864).

2⁶⁸¹⁷²⁷ is an apocalyptic number.

681727 is a deficient number, since it is larger than the sum of its proper divisors (1).

681727 is an equidigital number, since it uses as much as digits as its factorization.

681727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 681727 is about 825.6676086659. The cubic root of 681727 is about 88.0109748709.

The spelling of 681727 in words is "six hundred eighty-one thousand, seven hundred twenty-seven".