681841749 has 8 divisors (see below), whose sum is σ = 909426112. Its totient is φ = 454409280.

The previous prime is 681841717. The next prime is 681841753. The reversal of 681841749 is 947148186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681841749 - 2⁵ = 681841717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681841698 and 681841707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681841709) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27049 + ... + 45774.

It is an arithmetic number, because the mean of its divisors is an integer number (113678264).

Almost surely, 2^681841749 is an apocalyptic number.

It is an amenable number.

681841749 is a deficient number, since it is larger than the sum of its proper divisors (227584363).

681841749 is a wasteful number, since it uses less digits than its factorization.

681841749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75947.

The product of its digits is 387072, while the sum is 48.

The square root of 681841749 is about 26112.0996666296. The cubic root of 681841749 is about 880.1591262690.

The spelling of 681841749 in words is "six hundred eighty-one million, eight hundred forty-one thousand, seven hundred forty-nine".