681538833 has 16 divisors (see below), whose sum is σ = 1013343360. Its totient is φ = 452713968.

The previous prime is 681538799. The next prime is 681538841. The reversal of 681538833 is 338835186.

681538833 is a `hidden beast` number, since 6 + 81 + 538 + 8 + 33 = 666.

681538833 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681538833 - 2¹⁴ = 681522449 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (681538633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38085 + ... + 53042.

It is an arithmetic number, because the mean of its divisors is an integer number (63333960).

Almost surely, 2^681538833 is an apocalyptic number.

It is an amenable number.

681538833 is a deficient number, since it is larger than the sum of its proper divisors (331804527).

681538833 is a wasteful number, since it uses less digits than its factorization.

681538833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91413 (or 91407 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 681538833 is about 26106.2987227221. The cubic root of 681538833 is about 880.0287667077.

The spelling of 681538833 in words is "six hundred eighty-one million, five hundred thirty-eight thousand, eight hundred thirty-three".