681441 has 4 divisors (see below), whose sum is σ = 908592. Its totient is φ = 454292.

The previous prime is 681427. The next prime is 681449. The reversal of 681441 is 144186.

681441 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 681441 - 2⁵ = 681409 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

681441 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (681449) 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, 113571 + ... + 113576.

It is an arithmetic number, because the mean of its divisors is an integer number (227148).

2⁶⁸¹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

681441 is a deficient number, since it is larger than the sum of its proper divisors (227151).

681441 is a wasteful number, since it uses less digits than its factorization.

681441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227150.

The product of its digits is 768, while the sum is 24.

The square root of 681441 is about 825.4943973159. The cubic root of 681441 is about 87.9986656134.

The spelling of 681441 in words is "six hundred eighty-one thousand, four hundred forty-one".