681567 has 4 divisors (see below), whose sum is σ = 908760. Its totient is φ = 454376.

The previous prime is 681563. The next prime is 681589. The reversal of 681567 is 765186.

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 681567 - 2² = 681563 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681563) 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, 113592 + ... + 113597.

It is an arithmetic number, because the mean of its divisors is an integer number (227190).

2⁶⁸¹⁵⁶⁷ is an apocalyptic number.

681567 is a deficient number, since it is larger than the sum of its proper divisors (227193).

681567 is a wasteful number, since it uses less digits than its factorization.

681567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227192.

The product of its digits is 10080, while the sum is 33.

The square root of 681567 is about 825.5707116898. The cubic root of 681567 is about 88.0040889973.

The spelling of 681567 in words is "six hundred eighty-one thousand, five hundred sixty-seven".