681999013 has 8 divisors (see below), whose sum is σ = 753513408. Its totient is φ = 613973184.

The previous prime is 681999011. The next prime is 681999037. The reversal of 681999013 is 310999186.

681999013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 681999013 - 2¹ = 681999011 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 (681999011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871731 + ... + 872512.

It is an arithmetic number, because the mean of its divisors is an integer number (94189176).

Almost surely, 2^681999013 is an apocalyptic number.

It is an amenable number.

681999013 is a deficient number, since it is larger than the sum of its proper divisors (71514395).

681999013 is a wasteful number, since it uses less digits than its factorization.

681999013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744283.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 681999013 is about 26115.1108173027. The cubic root of 681999013 is about 880.2267894301.

The spelling of 681999013 in words is "six hundred eighty-one million, nine hundred ninety-nine thousand, thirteen".