681347 has 4 divisors (see below), whose sum is σ = 689640. Its totient is φ = 673056.

The previous prime is 681341. The next prime is 681361. The reversal of 681347 is 743186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681347 - 2⁸ = 681091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681341) 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, 4022 + ... + 4187.

It is an arithmetic number, because the mean of its divisors is an integer number (172410).

2⁶⁸¹³⁴⁷ is an apocalyptic number.

681347 is a deficient number, since it is larger than the sum of its proper divisors (8293).

681347 is an equidigital number, since it uses as much as digits as its factorization.

681347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8292.

The product of its digits is 4032, while the sum is 29.

The square root of 681347 is about 825.4374597751. The cubic root of 681347 is about 87.9946191613.

The spelling of 681347 in words is "six hundred eighty-one thousand, three hundred forty-seven".