681599841 has 32 divisors (see below), whose sum is σ = 993401472. Its totient is φ = 413199360.

The previous prime is 681599839. The next prime is 681599851. The reversal of 681599841 is 148995186.

It is not a de Polignac number, because 681599841 - 2¹ = 681599839 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681599851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 929511 + ... + 930243.

It is an arithmetic number, because the mean of its divisors is an integer number (31043796).

Almost surely, 2^681599841 is an apocalyptic number.

It is an amenable number.

681599841 is a deficient number, since it is larger than the sum of its proper divisors (311801631).

681599841 is a wasteful number, since it uses less digits than its factorization.

681599841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

The product of its digits is 622080, while the sum is 51.

The square root of 681599841 is about 26107.4671502235. The cubic root of 681599841 is about 880.0550245380.

The spelling of 681599841 in words is "six hundred eighty-one million, five hundred ninety-nine thousand, eight hundred forty-one".