681941671 has 4 divisors (see below), whose sum is σ = 682025344. Its totient is φ = 681858000.

The previous prime is 681941653. The next prime is 681941693. The reversal of 681941671 is 176149186.

681941671 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, and also an emirpimes, since its reverse is a distinct semiprime: 176149186 = 2 ⋅88074593.

It is a cyclic number.

It is not a de Polignac number, because 681941671 - 2⁵ = 681941639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681921671) 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, 28110 + ... + 46411.

It is an arithmetic number, because the mean of its divisors is an integer number (170506336).

Almost surely, 2^681941671 is an apocalyptic number.

681941671 is a deficient number, since it is larger than the sum of its proper divisors (83673).

681941671 is an equidigital number, since it uses as much as digits as its factorization.

681941671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83672.

The product of its digits is 72576, while the sum is 43.

The square root of 681941671 is about 26114.0129240988. The cubic root of 681941671 is about 880.2021191211.

The spelling of 681941671 in words is "six hundred eighty-one million, nine hundred forty-one thousand, six hundred seventy-one".