201831 has 12 divisors (see below), whose sum is σ = 313272. Its totient is φ = 115248.

The previous prime is 201829. The next prime is 201833. The reversal of 201831 is 138102.

It is a happy number.

201831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (201829) and next prime (201833).

It is not a de Polignac number, because 201831 - 2¹ = 201829 is a prime.

It is a super-2 number, since 2×201831² = 81471505122, 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 201831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540 + ... + 833.

It is an arithmetic number, because the mean of its divisors is an integer number (26106).

2²⁰¹⁸³¹ is an apocalyptic number.

201831 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

201831 is a deficient number, since it is larger than the sum of its proper divisors (111441).

201831 is a wasteful number, since it uses less digits than its factorization.

201831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390 (or 1383 counting only the distinct ones).

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

The square root of 201831 is about 449.2560517122. The cubic root of 201831 is about 58.6582754585.

Adding to 201831 its reverse (138102), we get a palindrome (339933).

The spelling of 201831 in words is "two hundred one thousand, eight hundred thirty-one".