681754834 has 12 divisors (see below), whose sum is σ = 1044860094. Its totient is φ = 333622544.

The previous prime is 681754819. The next prime is 681754841. The reversal of 681754834 is 438457186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 665794809 + 15960025 = 25803^2 + 3995^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 72739 + ... + 81574.

Almost surely, 2^681754834 is an apocalyptic number.

681754834 is a deficient number, since it is larger than the sum of its proper divisors (363105260).

681754834 is a wasteful number, since it uses less digits than its factorization.

681754834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154409 (or 154362 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 681754834 is about 26110.4353468111. The cubic root of 681754834 is about 880.1217264465.

The spelling of 681754834 in words is "six hundred eighty-one million, seven hundred fifty-four thousand, eight hundred thirty-four".