131831 has 8 divisors (see below), whose sum is σ = 155040. Its totient is φ = 109728.

The previous prime is 131797. The next prime is 131837. The reversal of 131831 is 138131.

131831 = 69² + 70² + ... + 89².

131831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 131831 - 2¹⁰ = 130807 is a prime.

It is a super-2 number, since 2×131831² = 34758825122, 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 (131837) 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, 5 + ... + 513.

It is an arithmetic number, because the mean of its divisors is an integer number (19380).

2¹³¹⁸³¹ is an apocalyptic number.

131831 is a deficient number, since it is larger than the sum of its proper divisors (23209).

131831 is an equidigital number, since it uses as much as digits as its factorization.

131831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553.

The product of its digits is 72, while the sum is 17.

The square root of 131831 is about 363.0853894059. The cubic root of 131831 is about 50.8946949284.

Adding to 131831 its reverse (138131), we get a palindrome (269962).

The spelling of 131831 in words is "one hundred thirty-one thousand, eight hundred thirty-one".