681940041 has 8 divisors (see below), whose sum is σ = 948786240. Its totient is φ = 434860272.

The previous prime is 681940033. The next prime is 681940117. The reversal of 681940041 is 140049186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681940041 - 2³ = 681940033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681939984 and 681940011.

It is not an unprimeable number, because it can be changed into a prime (681940141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4941526 + ... + 4941663.

It is an arithmetic number, because the mean of its divisors is an integer number (118598280).

Almost surely, 2^681940041 is an apocalyptic number.

It is an amenable number.

681940041 is a deficient number, since it is larger than the sum of its proper divisors (266846199).

681940041 is a wasteful number, since it uses less digits than its factorization.

681940041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9883215.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 681940041 is about 26113.9817147826. The cubic root of 681940041 is about 880.2014178243.

The spelling of 681940041 in words is "six hundred eighty-one million, nine hundred forty thousand, forty-one".