681769 has 4 divisors (see below), whose sum is σ = 743760. Its totient is φ = 619780.

The previous prime is 681763. The next prime is 681773. The reversal of 681769 is 967186.

681769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681769 - 2⁹ = 681257 is a prime.

It is a super-2 number, since 2×681769² = 929617938722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30979 + ... + 31000.

It is an arithmetic number, because the mean of its divisors is an integer number (185940).

2⁶⁸¹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

681769 is a deficient number, since it is larger than the sum of its proper divisors (61991).

681769 is a wasteful number, since it uses less digits than its factorization.

681769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61990.

The product of its digits is 18144, while the sum is 37.

The square root of 681769 is about 825.6930422379. The cubic root of 681769 is about 88.0127822342.

It can be divided in two parts, 6817 and 69, that added together give a palindrome (6886).

The spelling of 681769 in words is "six hundred eighty-one thousand, seven hundred sixty-nine".