681677 has 2 divisors, whose sum is σ = 681678. Its totient is φ = 681676.

The previous prime is 681673. The next prime is 681689. The reversal of 681677 is 776186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 32041 = 806^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 681677 - 2² = 681673 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681677.

It is not a weakly prime, because it can be changed into another prime (681673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340838 + 340839.

It is an arithmetic number, because the mean of its divisors is an integer number (340839).

2⁶⁸¹⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

681677 is a deficient number, since it is larger than the sum of its proper divisors (1).

681677 is an equidigital number, since it uses as much as digits as its factorization.

681677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 681677 is about 825.6373295824. The cubic root of 681677 is about 88.0088231511.

The spelling of 681677 in words is "six hundred eighty-one thousand, six hundred seventy-seven".