681329 has 8 divisors (see below), whose sum is σ = 775872. Its totient is φ = 592240.

The previous prime is 681311. The next prime is 681337. The reversal of 681329 is 923186.

681329 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 not a de Polignac number, because 681329 - 2¹² = 677233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681229) 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, 1094 + ... + 1599.

It is an arithmetic number, because the mean of its divisors is an integer number (96984).

2⁶⁸¹³²⁹ is an apocalyptic number.

It is an amenable number.

681329 is a deficient number, since it is larger than the sum of its proper divisors (94543).

681329 is a wasteful number, since it uses less digits than its factorization.

681329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727.

The product of its digits is 2592, while the sum is 29.

The square root of 681329 is about 825.4265563937. The cubic root of 681329 is about 87.9938442664.

The spelling of 681329 in words is "six hundred eighty-one thousand, three hundred twenty-nine".