100831 has 4 divisors (see below), whose sum is σ = 102600. Its totient is φ = 99064.

The previous prime is 100829. The next prime is 100847. The reversal of 100831 is 138001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138001 = 59 ⋅2339.

It is a cyclic number.

It is not a de Polignac number, because 100831 - 2¹ = 100829 is a prime.

It is a super-2 number, since 2×100831² = 20333781122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796 + ... + 913.

It is an arithmetic number, because the mean of its divisors is an integer number (25650).

2¹⁰⁰⁸³¹ is an apocalyptic number.

100831 is a deficient number, since it is larger than the sum of its proper divisors (1769).

100831 is an equidigital number, since it uses as much as digits as its factorization.

100831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 100831 is about 317.5389739859. The cubic root of 100831 is about 46.5441058375.

Adding to 100831 its reverse (138001), we get a palindrome (238832).

The spelling of 100831 in words is "one hundred thousand, eight hundred thirty-one".