681793771 has 4 divisors (see below), whose sum is σ = 688413232. Its totient is φ = 675174312.

The previous prime is 681793769. The next prime is 681793781. The reversal of 681793771 is 177397186.

681793771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681793771 - 2¹ = 681793769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681793711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3309576 + ... + 3309781.

It is an arithmetic number, because the mean of its divisors is an integer number (172103308).

Almost surely, 2^681793771 is an apocalyptic number.

681793771 is a deficient number, since it is larger than the sum of its proper divisors (6619461).

681793771 is a wasteful number, since it uses less digits than its factorization.

681793771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6619460.

The product of its digits is 444528, while the sum is 49.

The square root of 681793771 is about 26111.1809575898. The cubic root of 681793771 is about 880.1384815641.

The spelling of 681793771 in words is "six hundred eighty-one million, seven hundred ninety-three thousand, seven hundred seventy-one".