831681 has 8 divisors (see below), whose sum is σ = 1232160. Its totient is φ = 554436.

The previous prime is 831679. The next prime is 831683. The reversal of 831681 is 186138.

It is an interprime number because it is at equal distance from previous prime (831679) and next prime (831683).

It is not a de Polignac number, because 831681 - 2¹ = 831679 is a prime.

It is a super-2 number, since 2×831681² = 1383386571522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 30803 = 831681 / (8 + 3 + 1 + 6 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (831683) 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, 15375 + ... + 15428.

It is an arithmetic number, because the mean of its divisors is an integer number (154020).

2⁸³¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

831681 is a deficient number, since it is larger than the sum of its proper divisors (400479).

831681 is a wasteful number, since it uses less digits than its factorization.

831681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30812 (or 30806 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 831681 is about 911.9654598722. The cubic root of 831681 is about 94.0413655273.

831681 divided by its sum of digits (27) gives a palindrome (30803).

It can be divided in two parts, 83 and 1681, that added together give a square (1764 = 42²).

The spelling of 831681 in words is "eight hundred thirty-one thousand, six hundred eighty-one".