681808941 has 64 divisors (see below), whose sum is σ = 1159188480. Its totient is φ = 392040000.

The previous prime is 681808909. The next prime is 681808943. The reversal of 681808941 is 149808186.

It is not a de Polignac number, because 681808941 - 2⁵ = 681808909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681808943) 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 63 ways as a sum of consecutive naturals, for example, 1031151 + ... + 1031811.

It is an arithmetic number, because the mean of its divisors is an integer number (18112320).

Almost surely, 2^681808941 is an apocalyptic number.

It is an amenable number.

681808941 is a deficient number, since it is larger than the sum of its proper divisors (477379539).

681808941 is a wasteful number, since it uses less digits than its factorization.

681808941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 681808941 is about 26111.4714445586. The cubic root of 681808941 is about 880.1450092475.

The spelling of 681808941 in words is "six hundred eighty-one million, eight hundred eight thousand, nine hundred forty-one".