681871833 has 6 divisors (see below), whose sum is σ = 984925994. Its totient is φ = 454581216.

The previous prime is 681871811. The next prime is 681871843. The reversal of 681871833 is 338178186.

It can be written as a sum of positive squares in only one way, i.e., 667033929 + 14837904 = 25827^2 + 3852^2 .

It is not a de Polignac number, because 681871833 - 2⁹ = 681871321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681871843) 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 5 ways as a sum of consecutive naturals, for example, 37881760 + ... + 37881777.

Almost surely, 2^681871833 is an apocalyptic number.

It is an amenable number.

681871833 is a deficient number, since it is larger than the sum of its proper divisors (303054161).

681871833 is a wasteful number, since it uses less digits than its factorization.

681871833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75763543 (or 75763540 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 681871833 is about 26112.6757150622. The cubic root of 681871833 is about 880.1720707769.

The spelling of 681871833 in words is "six hundred eighty-one million, eight hundred seventy-one thousand, eight hundred thirty-three".