123831 has 6 divisors (see below), whose sum is σ = 178880. Its totient is φ = 82548.

The previous prime is 123829. The next prime is 123833. The reversal of 123831 is 138321.

It is an interprime number because it is at equal distance from previous prime (123829) and next prime (123833).

It is not a de Polignac number, because 123831 - 2¹ = 123829 is a prime.

It is a super-2 number, since 2×123831² = 30668233122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6871 + ... + 6888.

2¹²³⁸³¹ is an apocalyptic number.

123831 is a deficient number, since it is larger than the sum of its proper divisors (55049).

123831 is a wasteful number, since it uses less digits than its factorization.

123831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13765 (or 13762 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 123831 is about 351.8962915406. The cubic root of 123831 is about 49.8436449047.

It can be divided in two parts, 1 and 23831, that added together give a palindrome (23832).

The spelling of 123831 in words is "one hundred twenty-three thousand, eight hundred thirty-one".