681439313 has 8 divisors (see below), whose sum is σ = 717578400. Its totient is φ = 645327648.

The previous prime is 681439277. The next prime is 681439403. The reversal of 681439313 is 313934186.

It is a happy number.

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 681439313 - 2¹⁸ = 681177169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681739313) 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, 61970 + ... + 72132.

It is an arithmetic number, because the mean of its divisors is an integer number (89697300).

Almost surely, 2^681439313 is an apocalyptic number.

It is an amenable number.

681439313 is a deficient number, since it is larger than the sum of its proper divisors (36139087).

681439313 is a wasteful number, since it uses less digits than its factorization.

681439313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13711.

The product of its digits is 46656, while the sum is 38.

The square root of 681439313 is about 26104.3925997139. The cubic root of 681439313 is about 879.9859299575.

The spelling of 681439313 in words is "six hundred eighty-one million, four hundred thirty-nine thousand, three hundred thirteen".