681715 has 4 divisors (see below), whose sum is σ = 818064. Its totient is φ = 545368.

The previous prime is 681689. The next prime is 681719. The reversal of 681715 is 517186.

It is a happy number.

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 681715 - 2¹⁹ = 157427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681719) 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, 68167 + ... + 68176.

It is an arithmetic number, because the mean of its divisors is an integer number (204516).

2⁶⁸¹⁷¹⁵ is an apocalyptic number.

681715 is a deficient number, since it is larger than the sum of its proper divisors (136349).

681715 is a wasteful number, since it uses less digits than its factorization.

681715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136348.

The product of its digits is 1680, while the sum is 28.

The square root of 681715 is about 825.6603417871. The cubic root of 681715 is about 88.0104584677.

The spelling of 681715 in words is "six hundred eighty-one thousand, seven hundred fifteen".