681801 has 4 divisors (see below), whose sum is σ = 909072. Its totient is φ = 454532.

The previous prime is 681787. The next prime is 681809. The reversal of 681801 is 108186.

681801 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 681801 - 2⁷ = 681673 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681809) 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, 113631 + ... + 113636.

It is an arithmetic number, because the mean of its divisors is an integer number (227268).

2⁶⁸¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

681801 is a deficient number, since it is larger than the sum of its proper divisors (227271).

681801 is a wasteful number, since it uses less digits than its factorization.

681801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227270.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 681801 is about 825.7124196716. The cubic root of 681801 is about 88.0141592230.

Adding to 681801 its reverse (108186), we get a palindrome (789987).

The spelling of 681801 in words is "six hundred eighty-one thousand, eight hundred one".