681231 has 8 divisors (see below), whose sum is σ = 918064. Its totient is φ = 449280.

The previous prime is 681229. The next prime is 681251. The reversal of 681231 is 132186.

681231 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 681231 - 2¹ = 681229 is a prime.

It is a super-2 number, since 2×681231² = 928151350722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681198 and 681207.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681231.

It is not an unprimeable number, because it can be changed into a prime (681221) 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, 880 + ... + 1461.

It is an arithmetic number, because the mean of its divisors is an integer number (114758).

2⁶⁸¹²³¹ is an apocalyptic number.

681231 is a deficient number, since it is larger than the sum of its proper divisors (236833).

681231 is a wasteful number, since it uses less digits than its factorization.

681231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441.

The product of its digits is 288, while the sum is 21.

The square root of 681231 is about 825.3671910126. The cubic root of 681231 is about 87.9896251543.

The spelling of 681231 in words is "six hundred eighty-one thousand, two hundred thirty-one".