681944241 has 32 divisors (see below), whose sum is σ = 1009064448. Its totient is φ = 406218240.

The previous prime is 681944213. The next prime is 681944281. The reversal of 681944241 is 142449186.

It is not a de Polignac number, because 681944241 - 2⁷ = 681944113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 681944241.

It is not an unprimeable number, because it can be changed into a prime (681944201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 521110 + ... + 522416.

It is an arithmetic number, because the mean of its divisors is an integer number (31533264).

Almost surely, 2^681944241 is an apocalyptic number.

It is an amenable number.

681944241 is a deficient number, since it is larger than the sum of its proper divisors (327120207).

681944241 is a wasteful number, since it uses less digits than its factorization.

681944241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581.

The product of its digits is 55296, while the sum is 39.

The square root of 681944241 is about 26114.0621313498. The cubic root of 681944241 is about 880.2032248445.

The spelling of 681944241 in words is "six hundred eighty-one million, nine hundred forty-four thousand, two hundred forty-one".