681775 has 6 divisors (see below), whose sum is σ = 845432. Its totient is φ = 545400.

The previous prime is 681773. The next prime is 681781. The reversal of 681775 is 577186.

It is not a de Polignac number, because 681775 - 2¹ = 681773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13611 + ... + 13660.

2⁶⁸¹⁷⁷⁵ is an apocalyptic number.

681775 is a deficient number, since it is larger than the sum of its proper divisors (163657).

681775 is a wasteful number, since it uses less digits than its factorization.

681775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27281 (or 27276 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 681775 is about 825.6966755413. The cubic root of 681775 is about 88.0130404229.

The spelling of 681775 in words is "six hundred eighty-one thousand, seven hundred seventy-five".