681277 has 4 divisors (see below), whose sum is σ = 687420. Its totient is φ = 675136.

The previous prime is 681271. The next prime is 681293. The reversal of 681277 is 772186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 772186 = 2 ⋅386093.

It can be written as a sum of positive squares in 2 ways, for example, as 298116 + 383161 = 546^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 681277 - 2¹¹ = 679229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681271) 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 in 3 ways as a sum of consecutive naturals, for example, 2902 + ... + 3127.

It is an arithmetic number, because the mean of its divisors is an integer number (171855).

2⁶⁸¹²⁷⁷ is an apocalyptic number.

It is an amenable number.

681277 is a deficient number, since it is larger than the sum of its proper divisors (6143).

681277 is a wasteful number, since it uses less digits than its factorization.

681277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6142.

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

The square root of 681277 is about 825.3950569273. The cubic root of 681277 is about 87.9916056042.

Subtracting 681277 from its reverse (772186), we obtain a palindrome (90909).

It can be divided in two parts, 6812 and 77, that added together give a square (6889 = 83²).

The spelling of 681277 in words is "six hundred eighty-one thousand, two hundred seventy-seven".