681922918 has 16 divisors (see below), whose sum is σ = 1039085424. Its totient is φ = 335570400.

The previous prime is 681922867. The next prime is 681922949. The reversal of 681922918 is 819229186.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 253396 + ... + 256072.

It is an arithmetic number, because the mean of its divisors is an integer number (64942839).

Almost surely, 2^681922918 is an apocalyptic number.

681922918 is a deficient number, since it is larger than the sum of its proper divisors (357162506).

681922918 is a wasteful number, since it uses less digits than its factorization.

681922918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4647.

The product of its digits is 124416, while the sum is 46.

The square root of 681922918 is about 26113.6538615338. The cubic root of 681922918 is about 880.1940506981.

The spelling of 681922918 in words is "six hundred eighty-one million, nine hundred twenty-two thousand, nine hundred eighteen".