681941 has 4 divisors (see below), whose sum is σ = 734412. Its totient is φ = 629472.

The previous prime is 681931. The next prime is 681943. The reversal of 681941 is 149186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 461041 + 220900 = 679^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 681941 - 2¹⁰ = 680917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681943) 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, 26216 + ... + 26241.

It is an arithmetic number, because the mean of its divisors is an integer number (183603).

2⁶⁸¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

681941 is a deficient number, since it is larger than the sum of its proper divisors (52471).

681941 is a wasteful number, since it uses less digits than its factorization.

681941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52470.

The product of its digits is 1728, while the sum is 29.

The square root of 681941 is about 825.7971905983. The cubic root of 681941 is about 88.0201830428.

The spelling of 681941 in words is "six hundred eighty-one thousand, nine hundred forty-one".