1681831 has 8 divisors (see below), whose sum is σ = 1736000. Its totient is φ = 1628640.

The previous prime is 1681817. The next prime is 1681837. The reversal of 1681831 is 1381861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1681831 - 2⁷ = 1681703 is a prime.

It is a super-2 number, since 2×1681831² = 5657111025122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681837) 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, 4645 + ... + 4993.

It is an arithmetic number, because the mean of its divisors is an integer number (217000).

2^1681831 is an apocalyptic number.

1681831 is a deficient number, since it is larger than the sum of its proper divisors (54169).

1681831 is an equidigital number, since it uses as much as digits as its factorization.

1681831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 1152, while the sum is 28.

The square root of 1681831 is about 1296.8542709187. The cubic root of 1681831 is about 118.9216111570.

The spelling of 1681831 in words is "one million, six hundred eighty-one thousand, eight hundred thirty-one".