2001831 has 8 divisors (see below), whose sum is σ = 2874480. Its totient is φ = 1231872.

The previous prime is 2001809. The next prime is 2001833. The reversal of 2001831 is 1381002.

It is a happy number.

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

It is not a de Polignac number, because 2001831 - 2⁵ = 2001799 is a prime.

It is a super-2 number, since 2×2001831² = 8014654705122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2001831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25626 + ... + 25703.

It is an arithmetic number, because the mean of its divisors is an integer number (359310).

2^2001831 is an apocalyptic number.

2001831 is a deficient number, since it is larger than the sum of its proper divisors (872649).

2001831 is a wasteful number, since it uses less digits than its factorization.

2001831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51345.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2001831 is about 1414.8607705354. The cubic root of 2001831 is about 126.0305418529.

Adding to 2001831 its reverse (1381002), we get a palindrome (3382833).

The spelling of 2001831 in words is "two million, one thousand, eight hundred thirty-one".